CVE-2026-89422

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89422", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-09-11T18:45:01.480Z", "datePublished": "2026-09-22T08:49:16.171Z", "dateUpdated": "2026-09-22T13:08:15.912Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "packageName": "otp", "packageURL": "pkg:software-id/erlang.org/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_client_connection_1_3.erl", "lib/ssl/src/tls_gen_connection_1_3.erl", "lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}], "vendor": "Erlang", "versions": [{"changes": [{"at": "27.3.4.18", "status": "unaffected"}, {"at": "28.5.0.7", "status": "unaffected"}, {"at": "29.1.1", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "22.2", "versionType": "otp"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "packageName": "ssl", "packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "product": "OTP", "programFiles": ["src/tls_client_connection_1_3.erl", "src/tls_gen_connection_1_3.erl", "src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "11.2.12.13", "status": "unaffected"}, {"at": "11.6.0.6", "status": "unaffected"}, {"at": "11.7.7", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "9.5", "versionType": "otp"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_client_connection_1_3.erl", "lib/ssl/src/tls_gen_connection_1_3.erl", "lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "afec5156361bb50d3607c7c1a453c19b9149b324", "status": "unaffected"}, {"at": "98c66c858113949c4262d26cd7d426c4b09d2b35", "status": "unaffected"}, {"at": "fd1d9d07fc92ec0d59f96dfb66182195882bb7dd", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "21b8a1b0ad0adf200682b3854bc50114ab2b8c62", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "27.3.4.18", "versionStartIncluding": "22.2", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "28.5.0.7", "versionStartIncluding": "28.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "29.1.1", "versionStartIncluding": "29.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Milad Nasr / Anthropic"}, {"lang": "en", "type": "finder", "value": "Luna Tong / Anthropic"}, {"lang": "en", "type": "remediation developer", "value": "Ingela Andin"}], "dateAssigned": "2026-09-16T10:27:13.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A <code>pre_shared_key</code> extension in the <code>ServerHello</code> that the client never offered causes the client to complete the handshake without validating the server's certificate, so <code>ssl:connect</code> returns <code>{ok, Socket}</code> against a peer holding no certificate, no private key and no prior session.</p>\n<p><code>tls_client_connection_1_3:handle_server_hello/2</code> passes the received extension to <code>tls_gen_connection_1_3:handle_resumption/2</code>, which sets <code>resumption = true</code> on its mere presence without checking that the client offered a PSK. <code>tls_handshake_1_3:get_pre_shared_key/4</code> meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes <code>maybe_resumption/1</code> straight to <code>wait_finished</code>, skipping the certificate-handling states, so certificate path validation, <code>verify_fun</code>, hostname verification, <code>partial_chain</code>, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.</p>\n<p>This issue affects OTP from OTP&nbsp;22.2 before OTP&nbsp;27.3.4.18, OTP&nbsp;28.5.0.7, and OTP&nbsp;29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.</p>"}, {"base64": false, "type": "text/markdown", "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A `pre_shared_key` extension in the `ServerHello` that the client never offered causes the client to complete the handshake without validating the server's certificate, so `ssl:connect` returns `{ok, Socket}` against a peer holding no certificate, no private key and no prior session.\n\n`tls_client_connection_1_3:handle_server_hello/2` passes the received extension to `tls_gen_connection_1_3:handle_resumption/2`, which sets `resumption = true` on its mere presence without checking that the client offered a PSK. `tls_handshake_1_3:get_pre_shared_key/4` meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes `maybe_resumption/1` straight to `wait_finished`, skipping the certificate-handling states, so certificate path validation, `verify_fun`, hostname verification, `partial_chain`, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7."}], "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server's certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7."}], "impacts": [{"capecId": "CAPEC-94", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of <code>ssl:connect</code> that negotiates TLS 1.3 is affected, including <code>httpc</code> over HTTPS, database and messaging client libraries, and TLS distribution clients.</p>"}, {"base64": false, "type": "text/markdown", "value": "An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of `ssl:connect` that negotiates TLS 1.3 is affected, including `httpc` over HTTPS, database and messaging client libraries, and TLS distribution clients."}], "value": "An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of ssl:connect that negotiates TLS 1.3 is affected, including httpc over HTTPS, database and messaging client libraries, and TLS distribution clients."}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 9.3, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-322", "description": "CWE-322 Key Exchange without Entity Authentication", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-22T08:49:16.171Z"}, "references": [{"name": "GitHub Advisory", "tags": ["related", "vendor-advisory"], "url": "https://github.com/erlang/otp/security/advisories/GHSA-rgxr-4g4w-j875"}, {"name": "EEF CNA record for CVE-2026-89422", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-89422.html"}, {"name": "OSV record EEF-CVE-2026-89422", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-89422"}, {"name": "Erlang/OTP version ordering", "tags": ["x_version-scheme"], "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"}, {"name": "Introducing commit 21b8a1b in erlang/otp", "tags": ["related"], "url": "https://github.com/erlang/otp/commit/21b8a1b0ad0adf200682b3854bc50114ab2b8c62"}, {"name": "Fix commit afec515 in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/afec5156361bb50d3607c7c1a453c19b9149b324"}, {"name": "Fix commit 98c66c8 in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/98c66c858113949c4262d26cd7d426c4b09d2b35"}, {"name": "Fix commit fd1d9d0 in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/fd1d9d07fc92ec0d59f96dfb66182195882bb7dd"}], "source": {"discovery": "EXTERNAL"}, "title": "TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Restrict affected clients to TLS 1.2 by setting <code>{versions, ['tlsv1.2']}</code> in the client's <code>ssl</code> options. This avoids the vulnerable code path at the cost of losing TLS 1.3.</p>\n<p>No configuration both keeps TLS 1.3 and mitigates the issue.</p>"}, {"base64": false, "type": "text/markdown", "value": "Restrict affected clients to TLS 1.2 by setting `{versions, ['tlsv1.2']}` in the client's `ssl` options. This avoids the vulnerable code path at the cost of losing TLS 1.3.\n\nNo configuration both keeps TLS 1.3 and mitigates the issue."}], "value": "Restrict affected clients to TLS 1.2 by setting {versions, ['tlsv1.2']} in the client's ssl options. This avoids the vulnerable code path at the cost of losing TLS 1.3.\n\nNo configuration both keeps TLS 1.3 and mitigates the issue."}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-22T13:08:04.474621Z", "id": "CVE-2026-89422", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-22T13:08:15.912Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89422", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-09-22T13:08:04.474621Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-22T13:08:10.382Z"}}], "cna": {"title": "TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Milad Nasr / Anthropic"}, {"lang": "en", "type": "finder", "value": "Luna Tong / Anthropic"}, {"lang": "en", "type": "remediation developer", "value": "Ingela Andin"}], "impacts": [{"capecId": "CAPEC-94", "descriptions": [{"lang": "en", "value": "An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of ssl:connect that negotiates TLS 1.3 is affected, including httpc over HTTPS, database and messaging client libraries, and TLS distribution clients.", "supportingMedia": [{"type": "text/html", "value": "<p>An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of <code>ssl:connect</code> that negotiates TLS 1.3 is affected, including <code>httpc</code> over HTTPS, database and messaging client libraries, and TLS distribution clients.</p>", "base64": false}, {"type": "text/markdown", "value": "An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of `ssl:connect` that negotiates TLS 1.3 is affected, including `httpc` over HTTPS, database and messaging client libraries, and TLS distribution clients.", "base64": false}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "vendor": "Erlang", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "27.3.4.18", "status": "unaffected"}, {"at": "28.5.0.7", "status": "unaffected"}, {"at": "29.1.1", "status": "unaffected"}], "version": "22.2", "lessThan": "*", "versionType": "otp"}], "packageURL": "pkg:software-id/erlang.org/otp", "packageName": "otp", "programFiles": ["lib/ssl/src/tls_client_connection_1_3.erl", "lib/ssl/src/tls_gen_connection_1_3.erl", "lib/ssl/src/tls_handshake_1_3.erl"], "defaultStatus": "unaffected", "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "11.2.12.13", "status": "unaffected"}, {"at": "11.6.0.6", "status": "unaffected"}, {"at": "11.7.7", "status": "unaffected"}], "version": "9.5", "lessThan": "*", "versionType": "otp"}], "packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "packageName": "ssl", "programFiles": ["src/tls_client_connection_1_3.erl", "src/tls_gen_connection_1_3.erl", "src/tls_handshake_1_3.erl"], "defaultStatus": "unaffected", "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "afec5156361bb50d3607c7c1a453c19b9149b324", "status": "unaffected"}, {"at": "98c66c858113949c4262d26cd7d426c4b09d2b35", "status": "unaffected"}, {"at": "fd1d9d07fc92ec0d59f96dfb66182195882bb7dd", "status": "unaffected"}], "version": "21b8a1b0ad0adf200682b3854bc50114ab2b8c62", "lessThan": "*", "versionType": "git"}], "packageURL": "pkg:github/erlang/otp", "packageName": "erlang/otp", "programFiles": ["lib/ssl/src/tls_client_connection_1_3.erl", "lib/ssl/src/tls_gen_connection_1_3.erl", "lib/ssl/src/tls_handshake_1_3.erl"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}]}], "references": [{"url": "https://github.com/erlang/otp/security/advisories/GHSA-rgxr-4g4w-j875", "name": "GitHub Advisory", "tags": ["related", "vendor-advisory"]}, {"url": "https://cna.erlef.org/cves/CVE-2026-89422.html", "name": "EEF CNA record for CVE-2026-89422", "tags": ["related"]}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-89422", "name": "OSV record EEF-CVE-2026-89422", "tags": ["related"]}, {"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions", "name": "Erlang/OTP version ordering", "tags": ["x_version-scheme"]}, {"url": "https://github.com/erlang/otp/commit/21b8a1b0ad0adf200682b3854bc50114ab2b8c62", "name": "Introducing commit 21b8a1b in erlang/otp", "tags": ["related"]}, {"url": "https://github.com/erlang/otp/commit/afec5156361bb50d3607c7c1a453c19b9149b324", "name": "Fix commit afec515 in erlang/otp", "tags": ["patch"]}, {"url": "https://github.com/erlang/otp/commit/98c66c858113949c4262d26cd7d426c4b09d2b35", "name": "Fix commit 98c66c8 in erlang/otp", "tags": ["patch"]}, {"url": "https://github.com/erlang/otp/commit/fd1d9d07fc92ec0d59f96dfb66182195882bb7dd", "name": "Fix commit fd1d9d0 in erlang/otp", "tags": ["patch"]}], "workarounds": [{"lang": "en", "value": "Restrict affected clients to TLS 1.2 by setting {versions, ['tlsv1.2']} in the client's ssl options. This avoids the vulnerable code path at the cost of losing TLS 1.3.\n\nNo configuration both keeps TLS 1.3 and mitigates the issue.", "supportingMedia": [{"type": "text/html", "value": "<p>Restrict affected clients to TLS 1.2 by setting <code>{versions, ['tlsv1.2']}</code> in the client's <code>ssl</code> options. This avoids the vulnerable code path at the cost of losing TLS 1.3.</p>\n<p>No configuration both keeps TLS 1.3 and mitigates the issue.</p>", "base64": false}, {"type": "text/markdown", "value": "Restrict affected clients to TLS 1.2 by setting `{versions, ['tlsv1.2']}` in the client's `ssl` options. This avoids the vulnerable code path at the cost of losing TLS 1.3.\n\nNo configuration both keeps TLS 1.3 and mitigates the issue.", "base64": false}]}], "dateAssigned": "2026-09-16T10:27:13.000Z", "descriptions": [{"lang": "en", "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server's certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.", "supportingMedia": [{"type": "text/html", "value": "<p>Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A <code>pre_shared_key</code> extension in the <code>ServerHello</code> that the client never offered causes the client to complete the handshake without validating the server's certificate, so <code>ssl:connect</code> returns <code>{ok, Socket}</code> against a peer holding no certificate, no private key and no prior session.</p>\n<p><code>tls_client_connection_1_3:handle_server_hello/2</code> passes the received extension to <code>tls_gen_connection_1_3:handle_resumption/2</code>, which sets <code>resumption = true</code> on its mere presence without checking that the client offered a PSK. <code>tls_handshake_1_3:get_pre_shared_key/4</code> meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes <code>maybe_resumption/1</code> straight to <code>wait_finished</code>, skipping the certificate-handling states, so certificate path validation, <code>verify_fun</code>, hostname verification, <code>partial_chain</code>, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.</p>\n<p>This issue affects OTP from OTP&nbsp;22.2 before OTP&nbsp;27.3.4.18, OTP&nbsp;28.5.0.7, and OTP&nbsp;29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.</p>", "base64": false}, {"type": "text/markdown", "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A `pre_shared_key` extension in the `ServerHello` that the client never offered causes the client to complete the handshake without validating the server's certificate, so `ssl:connect` returns `{ok, Socket}` against a peer holding no certificate, no private key and no prior session.\n\n`tls_client_connection_1_3:handle_server_hello/2` passes the received extension to `tls_gen_connection_1_3:handle_resumption/2`, which sets `resumption = true` on its mere presence without checking that the client offered a PSK. `tls_handshake_1_3:get_pre_shared_key/4` meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes `maybe_resumption/1` straight to `wait_finished`, skipping the certificate-handling states, so certificate path validation, `verify_fun`, hostname verification, `partial_chain`, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-322", "description": "CWE-322 Key Exchange without Entity Authentication"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "27.3.4.18", "versionStartIncluding": "22.2"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "28.5.0.7", "versionStartIncluding": "28.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "29.1.1", "versionStartIncluding": "29.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-22T08:49:16.171Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89422", "state": "PUBLISHED", "dateUpdated": "2026-09-22T13:08:15.912Z", "dateReserved": "2026-09-11T18:45:01.480Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-09-22T08:49:16.171Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "packageName": "otp", "packageURL": "pkg:software-id/erlang.org/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_client_connection_1_3.erl", "lib/ssl/src/tls_gen_connection_1_3.erl", "lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}], "vendor": "Erlang", "versions": [{"changes": [{"at": "27.3.4.18", "status": "unaffected"}, {"at": "28.5.0.7", "status": "unaffected"}, {"at": "29.1.1", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "22.2", "versionType": "otp"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "packageName": "ssl", "packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "product": "OTP", "programFiles": ["src/tls_client_connection_1_3.erl", "src/tls_gen_connection_1_3.erl", "src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "11.2.12.13", "status": "unaffected"}, {"at": "11.6.0.6", "status": "unaffected"}, {"at": "11.7.7", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "9.5", "versionType": "otp"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_client_connection_1_3", "tls_gen_connection_1_3", "tls_handshake_1_3"], "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_client_connection_1_3.erl", "lib/ssl/src/tls_gen_connection_1_3.erl", "lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_client_connection_1_3:handle_server_hello/2"}, {"name": "tls_client_connection_1_3:handle_encrypted_extensions/2"}, {"name": "tls_client_connection_1_3:maybe_resumption/1"}, {"name": "tls_gen_connection_1_3:handle_resumption/2"}, {"name": "tls_handshake_1_3:get_pre_shared_key/4"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "afec5156361bb50d3607c7c1a453c19b9149b324", "status": "unaffected"}, {"at": "98c66c858113949c4262d26cd7d426c4b09d2b35", "status": "unaffected"}, {"at": "fd1d9d07fc92ec0d59f96dfb66182195882bb7dd", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "21b8a1b0ad0adf200682b3854bc50114ab2b8c62", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server's certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7."}], "id": "CVE-2026-89422", "lastModified": "2026-09-22T19:09:32.273", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89422", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-22T13:08:04.474621Z", "version": "2.0.3"}}]}, "published": "2026-09-22T09:17:05.540", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-89422.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/21b8a1b0ad0adf200682b3854bc50114ab2b8c62"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/98c66c858113949c4262d26cd7d426c4b09d2b35"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/afec5156361bb50d3607c7c1a453c19b9149b324"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/fd1d9d07fc92ec0d59f96dfb66182195882bb7dd"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/security/advisories/GHSA-rgxr-4g4w-j875"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-89422"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-322"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[22.2,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[9.5,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "21b8a1b0ad0adf200682b3854bc50114ab2b8c62"}}], "enrichment": {"confidence": 90.0, "confidence_source": "inferred", "scores": [{"score": 90.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "erlang/otp", "vendor": "erlang"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[22.2,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OTP", "source": "cna", "vendor": "Erlang"}, "product": "otp", "vendor": "erlang"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[9.5,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OTP", "source": "cna", "vendor": "Erlang"}, "product": "otp", "vendor": "erlang"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "21b8a1b0ad0adf200682b3854bc50114ab2b8c62"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OTP", "source": "cna", "vendor": "Erlang"}, "product": "otp", "vendor": "erlang"}], "created": "2026-09-22T10:30:17.557060+00:00", "updated": "2026-09-22T13:00:13.353781+00:00", "vendors": ["erlang", "erlang$PRODUCT$erlang/otp", "erlang$PRODUCT$otp"]}