CVE-2026-55952

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55952", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-06-17T17:55:15.686Z", "datePublished": "2026-07-02T16:06:08.474Z", "dateUpdated": "2026-11-11T14:58:32.325Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_handshake_1_3"], "packageName": "otp", "packageURL": "pkg:software-id/erlang.org/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}], "vendor": "Erlang", "versions": [{"changes": [{"at": "27.3.4.14", "status": "unaffected"}, {"at": "28.5.0.3", "status": "unaffected"}, {"at": "29.0.3", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "22.2", "versionType": "otp"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["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_handshake_1_3.erl"], "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "11.2.12.10", "status": "unaffected"}, {"at": "11.6.0.3", "status": "unaffected"}, {"at": "11.7.3", "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_handshake_1_3"], "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "095f744713c325acdbd18c23e397f04593c06275", "status": "unaffected"}, {"at": "e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce", "status": "unaffected"}, {"at": "2c3e599797644310e5d4aa39c7193420e59dadff", "status": "unaffected"}, {"at": "9b5437c72fa3403a75c1aba28e5c532bc191c662", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "339a279f02ce38a7b23010e56000613e19abb21f", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The vulnerability only affects TLS 1.3 servers that have session tickets enabled (either stateful or stateless mode). TLS 1.2 connections and clients are not affected.</p>"}, {"base64": false, "type": "text/markdown", "value": "The vulnerability only affects TLS 1.3 servers that have session tickets enabled (either stateful or stateless mode). TLS 1.2 connections and clients are not affected."}], "value": "The vulnerability only affects TLS 1.3 servers that have session tickets enabled (either stateful or stateless mode). TLS 1.2 connections and clients are not affected."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "27.3.4.14", "versionStartIncluding": "22.2", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "28.5.0.3", "versionStartIncluding": "28.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "29.0.3", "versionStartIncluding": "29.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Lukas Backstr\u00f6m"}, {"lang": "en", "type": "remediation developer", "value": "Ingela Anderton Andin"}, {"lang": "en", "type": "remediation reviewer", "value": "Dan Gudmundsson"}, {"lang": "en", "type": "remediation reviewer", "value": "Jakub Witczak"}], "datePublic": "2026-07-02T16:06:08.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The Erlang/OTP <code>ssl</code> application does not validate that the PSK identity list and binder list carried in a TLS 1.3 <code>ClientHello</code> pre-shared key extension have equal length before passing them to the session ticket handler. In <code>tls_handshake_1_3:handle_pre_shared_key/3</code>, an <code>OfferedPreSharedKeys</code> record with a mismatched number of identities and binders is forwarded directly to <code>tls_server_session_ticket:use/4</code>, which crashes the session ticket handler process.</p>\n<p>An unauthenticated remote attacker can send a single crafted <code>ClientHello</code> to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the <code>ssl</code> application is restarted. TLS 1.2 connections are not affected.</p>\n<p>This issue affects OTP from OTP&nbsp;22.2 before OTP&nbsp;27.3.4.14, OTP&nbsp;28.5.0.3, and OTP&nbsp;29.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3.</p>"}, {"base64": false, "type": "text/markdown", "value": "The Erlang/OTP `ssl` application does not validate that the PSK identity list and binder list carried in a TLS 1.3 `ClientHello` pre-shared key extension have equal length before passing them to the session ticket handler. In `tls_handshake_1_3:handle_pre_shared_key/3`, an `OfferedPreSharedKeys` record with a mismatched number of identities and binders is forwarded directly to `tls_server_session_ticket:use/4`, which crashes the session ticket handler process.\n\nAn unauthenticated remote attacker can send a single crafted `ClientHello` to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the `ssl` application is restarted. TLS 1.2 connections are not affected.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.14, OTP\u00a028.5.0.3, and OTP\u00a029.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3."}], "value": "The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process.\n\nAn unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.14, OTP\u00a028.5.0.3, and OTP\u00a029.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3."}], "impacts": [{"capecId": "CAPEC-153", "descriptions": [{"lang": "en", "value": "CAPEC-153 Input Data Manipulation"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.2, "baseSeverity": "HIGH", "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:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-11T14:58:32.325Z"}, "references": [{"name": "Denial-of-Service for TLS-1.3 server Using Session Tickets", "tags": ["vendor-advisory", "related"], "url": "https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59"}, {"name": "EEF CNA record for CVE-2026-55952", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-55952.html"}, {"name": "OSV record EEF-CVE-2026-55952", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-55952"}, {"name": "Erlang/OTP version ordering", "tags": ["x_version-scheme"], "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"}, {"name": "Introducing commit 339a279 in erlang/otp", "tags": ["related"], "url": "https://github.com/erlang/otp/commit/339a279f02ce38a7b23010e56000613e19abb21f"}, {"name": "Fix commit 095f744 in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/095f744713c325acdbd18c23e397f04593c06275"}, {"name": "Fix commit e77823e in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce"}, {"name": "Fix commit 2c3e599 in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff"}, {"name": "Fix commit 9b5437c in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662"}], "source": {"discovery": "INTERNAL"}, "title": "TLS 1.3 server denial of service via malformed ClientHello pre-shared key extension", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<ul>\n<li>Disable session tickets on TLS 1.3 servers by setting <code>session_tickets</code> to <code>disabled</code> in the server's <code>ssl</code> options.</li>\n<li>Restrict the server to TLS 1.2 by setting <code>versions</code> to <code>['tlsv1.2']</code> in the server's <code>ssl</code> options.</li>\n</ul>"}, {"base64": false, "type": "text/markdown", "value": "* Disable session tickets on TLS 1.3 servers by setting `session_tickets` to `disabled` in the server's `ssl` options.\n* Restrict the server to TLS 1.2 by setting `versions` to `['tlsv1.2']` in the server's `ssl` options."}], "value": "* Disable session tickets on TLS 1.3 servers by setting session_tickets to disabled in the server's ssl options.\n* Restrict the server to TLS 1.2 by setting versions to ['tlsv1.2'] in the server's ssl options."}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-02T17:28:09.569991Z", "id": "CVE-2026-55952", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-02T17:28:15.681Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55952", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-02T17:28:09.569991Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-02T17:28:12.551Z"}}], "cna": {"title": "TLS 1.3 server denial of service via malformed ClientHello pre-shared key extension", "source": {"discovery": "INTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Lukas Backstr\u00f6m"}, {"lang": "en", "type": "remediation developer", "value": "Ingela Anderton Andin"}, {"lang": "en", "type": "remediation reviewer", "value": "Dan Gudmundsson"}, {"lang": "en", "type": "remediation reviewer", "value": "Jakub Witczak"}], "impacts": [{"capecId": "CAPEC-153", "descriptions": [{"lang": "en", "value": "CAPEC-153 Input Data Manipulation"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "vendor": "Erlang", "modules": ["tls_handshake_1_3"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "27.3.4.14", "status": "unaffected"}, {"at": "28.5.0.3", "status": "unaffected"}, {"at": "29.0.3", "status": "unaffected"}], "version": "22.2", "lessThan": "*", "versionType": "otp"}], "packageURL": "pkg:software-id/erlang.org/otp", "packageName": "otp", "programFiles": ["lib/ssl/src/tls_handshake_1_3.erl"], "defaultStatus": "unaffected", "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["tls_handshake_1_3"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "11.2.12.10", "status": "unaffected"}, {"at": "11.6.0.3", "status": "unaffected"}, {"at": "11.7.3", "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_handshake_1_3.erl"], "defaultStatus": "unaffected", "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["tls_handshake_1_3"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "095f744713c325acdbd18c23e397f04593c06275", "status": "unaffected"}, {"at": "e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce", "status": "unaffected"}, {"at": "2c3e599797644310e5d4aa39c7193420e59dadff", "status": "unaffected"}, {"at": "9b5437c72fa3403a75c1aba28e5c532bc191c662", "status": "unaffected"}], "version": "339a279f02ce38a7b23010e56000613e19abb21f", "lessThan": "*", "versionType": "git"}], "packageURL": "pkg:github/erlang/otp", "packageName": "erlang/otp", "programFiles": ["lib/ssl/src/tls_handshake_1_3.erl"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}]}], "datePublic": "2026-07-02T16:06:08.000Z", "references": [{"url": "https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59", "name": "Denial-of-Service for TLS-1.3 server Using Session Tickets", "tags": ["vendor-advisory", "related"]}, {"url": "https://cna.erlef.org/cves/CVE-2026-55952.html", "name": "EEF CNA record for CVE-2026-55952", "tags": ["related"]}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-55952", "name": "OSV record EEF-CVE-2026-55952", "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/339a279f02ce38a7b23010e56000613e19abb21f", "name": "Introducing commit 339a279 in erlang/otp", "tags": ["related"]}, {"url": "https://github.com/erlang/otp/commit/095f744713c325acdbd18c23e397f04593c06275", "name": "Fix commit 095f744 in erlang/otp", "tags": ["patch"]}, {"url": "https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce", "name": "Fix commit e77823e in erlang/otp", "tags": ["patch"]}, {"url": "https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff", "name": "Fix commit 2c3e599 in erlang/otp", "tags": ["patch"]}, {"url": "https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662", "name": "Fix commit 9b5437c in erlang/otp", "tags": ["patch"]}], "workarounds": [{"lang": "en", "value": "* Disable session tickets on TLS 1.3 servers by setting session_tickets to disabled in the server's ssl options.\n* Restrict the server to TLS 1.2 by setting versions to ['tlsv1.2'] in the server's ssl options.", "supportingMedia": [{"type": "text/html", "value": "<ul>\n<li>Disable session tickets on TLS 1.3 servers by setting <code>session_tickets</code> to <code>disabled</code> in the server's <code>ssl</code> options.</li>\n<li>Restrict the server to TLS 1.2 by setting <code>versions</code> to <code>['tlsv1.2']</code> in the server's <code>ssl</code> options.</li>\n</ul>", "base64": false}, {"type": "text/markdown", "value": "* Disable session tickets on TLS 1.3 servers by setting `session_tickets` to `disabled` in the server's `ssl` options.\n* Restrict the server to TLS 1.2 by setting `versions` to `['tlsv1.2']` in the server's `ssl` options.", "base64": false}]}], "descriptions": [{"lang": "en", "value": "The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process.\n\nAn unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.14, OTP\u00a028.5.0.3, and OTP\u00a029.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3.", "supportingMedia": [{"type": "text/html", "value": "<p>The Erlang/OTP <code>ssl</code> application does not validate that the PSK identity list and binder list carried in a TLS 1.3 <code>ClientHello</code> pre-shared key extension have equal length before passing them to the session ticket handler. In <code>tls_handshake_1_3:handle_pre_shared_key/3</code>, an <code>OfferedPreSharedKeys</code> record with a mismatched number of identities and binders is forwarded directly to <code>tls_server_session_ticket:use/4</code>, which crashes the session ticket handler process.</p>\n<p>An unauthenticated remote attacker can send a single crafted <code>ClientHello</code> to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the <code>ssl</code> application is restarted. TLS 1.2 connections are not affected.</p>\n<p>This issue affects OTP from OTP&nbsp;22.2 before OTP&nbsp;27.3.4.14, OTP&nbsp;28.5.0.3, and OTP&nbsp;29.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3.</p>", "base64": false}, {"type": "text/markdown", "value": "The Erlang/OTP `ssl` application does not validate that the PSK identity list and binder list carried in a TLS 1.3 `ClientHello` pre-shared key extension have equal length before passing them to the session ticket handler. In `tls_handshake_1_3:handle_pre_shared_key/3`, an `OfferedPreSharedKeys` record with a mismatched number of identities and binders is forwarded directly to `tls_server_session_ticket:use/4`, which crashes the session ticket handler process.\n\nAn unauthenticated remote attacker can send a single crafted `ClientHello` to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the `ssl` application is restarted. TLS 1.2 connections are not affected.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.14, OTP\u00a028.5.0.3, and OTP\u00a029.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input"}]}], "configurations": [{"lang": "en", "value": "The vulnerability only affects TLS 1.3 servers that have session tickets enabled (either stateful or stateless mode). TLS 1.2 connections and clients are not affected.", "supportingMedia": [{"type": "text/html", "value": "<p>The vulnerability only affects TLS 1.3 servers that have session tickets enabled (either stateful or stateless mode). TLS 1.2 connections and clients are not affected.</p>", "base64": false}, {"type": "text/markdown", "value": "The vulnerability only affects TLS 1.3 servers that have session tickets enabled (either stateful or stateless mode). TLS 1.2 connections and clients are not affected.", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "27.3.4.14", "versionStartIncluding": "22.2"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "28.5.0.3", "versionStartIncluding": "28.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "29.0.3", "versionStartIncluding": "29.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-11T14:58:32.325Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55952", "state": "PUBLISHED", "dateUpdated": "2026-11-11T14:58:32.325Z", "dateReserved": "2026-06-17T17:55:15.686Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-07-02T16:06:08.474Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["tls_handshake_1_3"], "packageName": "otp", "packageURL": "pkg:software-id/erlang.org/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}], "vendor": "Erlang", "versions": [{"changes": [{"at": "27.3.4.14", "status": "unaffected"}, {"at": "28.5.0.3", "status": "unaffected"}, {"at": "29.0.3", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "22.2", "versionType": "otp"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["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_handshake_1_3.erl"], "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "11.2.12.10", "status": "unaffected"}, {"at": "11.6.0.3", "status": "unaffected"}, {"at": "11.7.3", "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_handshake_1_3"], "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "programFiles": ["lib/ssl/src/tls_handshake_1_3.erl"], "programRoutines": [{"name": "tls_handshake_1_3:handle_pre_shared_key/3"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "095f744713c325acdbd18c23e397f04593c06275", "status": "unaffected"}, {"at": "e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce", "status": "unaffected"}, {"at": "2c3e599797644310e5d4aa39c7193420e59dadff", "status": "unaffected"}, {"at": "9b5437c72fa3403a75c1aba28e5c532bc191c662", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "339a279f02ce38a7b23010e56000613e19abb21f", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "matchCriteriaId": "B6121E70-2794-46A4-A282-817CC75FA8CE", "versionEndExcluding": "27.3.4.14", "versionStartIncluding": "22.2", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "matchCriteriaId": "230E3EE3-6A18-4848-8E3D-DB0FAA8EDFDC", "versionEndExcluding": "28.5.0.3", "versionStartIncluding": "28.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "matchCriteriaId": "5D2D0C24-E302-48BF-9550-CCC7ABA24BED", "versionEndExcluding": "29.0.3", "versionStartIncluding": "29.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/ssl:*:*:*:*:*:*:*:*", "matchCriteriaId": "04922CED-B13F-4CA5-A700-D96B6C589324", "versionEndExcluding": "11.2.12.10", "versionStartIncluding": "9.5", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/ssl:*:*:*:*:*:*:*:*", "matchCriteriaId": "670E1622-32D4-45D0-A05E-9A3F76CC0F15", "versionEndExcluding": "11.6.0.3", "versionStartIncluding": "11.3", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/ssl:*:*:*:*:*:*:*:*", "matchCriteriaId": "217D7CA5-49E9-4805-A2F6-32EC75F6EE91", "versionEndExcluding": "11.7.3", "versionStartIncluding": "11.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process.\n\nAn unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.14, OTP\u00a028.5.0.3, and OTP\u00a029.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3."}, {"lang": "es", "value": "La aplicaci\u00f3n ssl de Erlang/OTP no valida que la lista de identidades PSK y la lista de \u2019binders\u2019 transportadas en una extensi\u00f3n de clave precompartida de ClientHello de TLS 1.3 tengan la misma longitud antes de pasarlas al gestor de tickets de sesi\u00f3n. En tls_handshake_1_3:handle_pre_shared_key/3, un registro OfferedPreSharedKeys con un n\u00famero no coincidente de identidades y \u2019binders\u2019 se reenv\u00eda directamente a tls_server_session_ticket:use/4, lo que provoca la ca\u00edda del proceso del gestor de tickets de sesi\u00f3n.\n\nUn atacante remoto no autenticado puede enviar un \u00fanico ClientHello manipulado a un servidor TLS 1.3 con tickets de sesi\u00f3n habilitados (modo con estado o sin estado) y perturbar permanentemente el manejo de tickets de sesi\u00f3n en esa escucha. Los nuevos \u2019handshakes\u2019 de TLS 1.3 se completan pero posteriormente fallan cuando el servidor intenta emitir un ticket de sesi\u00f3n, haciendo que TLS 1.3 sea efectivamente inutilizable en la escucha afectada hasta que se reinicie la aplicaci\u00f3n ssl. Las conexiones TLS 1.2 no se ven afectadas.\n\nEste problema afecta a OTP desde 22.2 antes de 29.0.3, 28.5.0.3 y 27.3.4.14 correspondiente a ssl desde 9.5 antes de 11.7.3, 11.6.0.3 y 11.2.12.10."}], "id": "CVE-2026-55952", "lastModified": "2026-11-11T15:17:23.683", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "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:P/PR:N/UI:N/VC:N/VI:N/VA:H/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55952", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-02T17:28:09.569991Z", "version": "2.0.3"}}]}, "published": "2026-07-02T17:17:03.067", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-55952.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/095f744713c325acdbd18c23e397f04593c06275"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/339a279f02ce38a7b23010e56000613e19abb21f"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Vendor Advisory"], "url": "https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-55952"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Release Notes"], "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1284"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{"bugzilla": {"description": "erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling", "id": "2496626", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496626"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-130", "details": ["A flaw was found in Erlang/OTP's SSL (Secure Sockets Layer) application. An unauthenticated remote attacker can send a specially crafted ClientHello message to a TLS 1.3 server with session tickets enabled. This can permanently disrupt the server's ability to handle session tickets, leading to a Denial of Service (DoS) for new TLS 1.3 connections until the SSL application is restarted. This vulnerability is caused by improper validation of PSK (Pre-Shared Key) identity and binder list lengths."], "mitigation": {"lang": "en:us", "value": "Restarting the ssl application restores TLS 1.3 functionality after a crash. TLS 1.2 connections are not affected. Disabling TLS 1.3 session tickets (stateful and stateless) eliminates the attack surface."}, "name": "CVE-2026-55952", "package_state": [{"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "erlang", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Affected", "package_name": "erlang", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "erlang", "product_name": "Red Hat OpenStack Platform 18.0"}], "public_date": "2026-07-02T16:06:08Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55952\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55952\nhttps://cna.erlef.org/cves/CVE-2026-55952.html\nhttps://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff\nhttps://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662\nhttps://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce\nhttps://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59\nhttps://osv.dev/vulnerability/EEF-CVE-2026-55952\nhttps://www.erlang.org/doc/system/versions.html#order-of-versions"], "statement": "A flaw was found in the Erlang/OTP ssl application. The TLS 1.3 session ticket handler does not validate that PSK identity and binder lists have equal length, allowing an unauthenticated attacker to crash session ticket handling via a crafted ClientHello, making TLS 1.3 unusable until the ssl application is restarted.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[9.5,11.2.12.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[22.2,27.3.4.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[339a279f02ce38a7b23010e56000613e19abb21f,e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "erlang/otp", "vendor": "erlang"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[9.5,11.2.12.10)"}}], "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": "[22.2,27.3.4.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[339a279f02ce38a7b23010e56000613e19abb21f,e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce)"}}], "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": "2026-07-02T18:00:05.158676+00:00", "updated": "2026-08-03T05:45:03.268309+00:00", "vendors": ["erlang", "erlang$PRODUCT$erlang/otp", "erlang$PRODUCT$otp"]}