CVE-2026-42792

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42792", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-04-29T18:06:33.251Z", "datePublished": "2026-07-27T14:58:24.426Z", "dateUpdated": "2026-11-11T19:09:12.847Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["epmd_srv"], "packageName": "otp", "packageURL": "pkg:software-id/erlang.org/otp", "product": "OTP", "programFiles": ["erts/epmd/src/epmd_srv.c"], "programRoutines": [{"name": "do_accept"}], "vendor": "Erlang", "versions": [{"changes": [{"at": "27.3.4.15", "status": "unaffected"}, {"at": "28.5.0.4", "status": "unaffected"}, {"at": "29.0.4", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "17.0", "versionType": "otp"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["epmd_srv"], "packageName": "erts", "packageURL": "pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "product": "OTP", "programFiles": ["epmd/src/epmd_srv.c"], "programRoutines": [{"name": "do_accept"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "15.2.7.11", "status": "unaffected"}, {"at": "16.4.0.4", "status": "unaffected"}, {"at": "17.0.4", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "6.0", "versionType": "otp"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["epmd_srv"], "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "programFiles": ["erts/epmd/src/epmd_srv.c"], "programRoutines": [{"name": "do_accept"}], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"lessThan": "865d203e4a6a8f44179eced9e1428f9259e4a3bb", "status": "affected", "version": "07b8f441ca711f9812fad9e9115bab3c3aa92f79", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "27.3.4.15", "versionStartIncluding": "17.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "28.5.0.4", "versionStartIncluding": "28.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "29.0.4", "versionStartIncluding": "29.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Ryan Moore"}, {"lang": "en", "type": "remediation developer", "value": "John H\u00f6gberg"}], "datePublic": "2026-07-27T14:58:24.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Improper Handling of Exceptional Conditions vulnerability in Erlang OTP <code>erts</code> (<code>epmd</code>) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.</p>\n<p>The <code>do_accept</code> function in <code>erts/epmd/src/epmd_srv.c</code> calls <code>epmd_cleanup_exit()</code> when <code>accept(2)</code> returns <code>EMFILE</code> (per-process file descriptor limit reached) or <code>ENFILE</code> (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing <code>accept(2)</code> to return <code>EMFILE</code>, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.</p>\n<p>On Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both <code>epmd.service</code> and <code>epmd.socket</code> and requiring manual operator intervention to recover.</p>\n<p>This issue affects OTP from OTP&nbsp;17.0 before OTP&nbsp;27.3.4.15, OTP&nbsp;28.5.0.4, and OTP&nbsp;29.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4.</p>"}, {"base64": false, "type": "text/markdown", "value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP `erts` (`epmd`) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe `do_accept` function in `erts/epmd/src/epmd_srv.c` calls `epmd_cleanup_exit()` when `accept(2)` returns `EMFILE` (per-process file descriptor limit reached) or `ENFILE` (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing `accept(2)` to return `EMFILE`, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both `epmd.service` and `epmd.socket` and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, OTP\u00a028.5.0.4, and OTP\u00a029.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4."}], "value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit() when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, OTP\u00a028.5.0.4, and OTP\u00a029.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4."}], "impacts": [{"capecId": "CAPEC-227", "descriptions": [{"lang": "en", "value": "CAPEC-227 Sustained Client Engagement"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 6.3, "baseSeverity": "MEDIUM", "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:L/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-755", "description": "CWE-755 Improper Handling of Exceptional Conditions", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-11T19:09:12.847Z"}, "references": [{"name": "epmd: Denial-of-service via accept(EMFILE)", "tags": ["vendor-advisory", "related"], "url": "https://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6"}, {"name": "EEF CNA record for CVE-2026-42792", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-42792.html"}, {"name": "OSV record EEF-CVE-2026-42792", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-42792"}, {"name": "Erlang/OTP version ordering", "tags": ["x_version-scheme"], "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"}, {"name": "Introducing commit 07b8f44 in erlang/otp", "tags": ["related"], "url": "https://github.com/erlang/otp/commit/07b8f441ca711f9812fad9e9115bab3c3aa92f79"}, {"name": "Fix commit 865d203 in erlang/otp", "tags": ["patch"], "url": "https://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb"}], "source": {"discovery": "EXTERNAL"}, "title": "epmd permanent DoS via EMFILE on accept(2) in erts", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<ul>\n<li>Restrict epmd to loopback only by adding a systemd socket override: set <code>ListenStream=</code> (empty, to clear), then <code>ListenStream=127.0.0.1:4369</code> and <code>ListenStream=[::1]:4369</code> in <code>/etc/systemd/system/epmd.socket.d/override.conf</code>.</li>\n<li>On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding <code>LimitNOFILE=65536</code> and <code>Restart=always</code> with a suitable <code>RestartSec</code> in <code>/etc/systemd/system/epmd.service.d/override.conf</code>.</li>\n<li>Restrict network access to TCP port 4369 via firewall rules to trusted hosts only.</li>\n</ul>"}, {"base64": false, "type": "text/markdown", "value": "* Restrict epmd to loopback only by adding a systemd socket override: set `ListenStream=` (empty, to clear), then `ListenStream=127.0.0.1:4369` and `ListenStream=[::1]:4369` in `/etc/systemd/system/epmd.socket.d/override.conf`.\n* On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding `LimitNOFILE=65536` and `Restart=always` with a suitable `RestartSec` in `/etc/systemd/system/epmd.service.d/override.conf`.\n* Restrict network access to TCP port 4369 via firewall rules to trusted hosts only."}], "value": "* Restrict epmd to loopback only by adding a systemd socket override: set ListenStream= (empty, to clear), then ListenStream=127.0.0.1:4369 and ListenStream=[::1]:4369 in /etc/systemd/system/epmd.socket.d/override.conf.\n* On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding LimitNOFILE=65536 and Restart=always with a suitable RestartSec in /etc/systemd/system/epmd.service.d/override.conf.\n* Restrict network access to TCP port 4369 via firewall rules to trusted hosts only."}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-27T17:25:58.879765Z", "id": "CVE-2026-42792", "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": "2026-07-27T17:26:08.579Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42792", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-27T17:25:58.879765Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-27T17:26:04.514Z"}}], "cna": {"title": "epmd permanent DoS via EMFILE on accept(2) in erts", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Ryan Moore"}, {"lang": "en", "type": "remediation developer", "value": "John H\u00f6gberg"}], "impacts": [{"capecId": "CAPEC-227", "descriptions": [{"lang": "en", "value": "CAPEC-227 Sustained Client Engagement"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "vendor": "Erlang", "modules": ["epmd_srv"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "27.3.4.15", "status": "unaffected"}, {"at": "28.5.0.4", "status": "unaffected"}, {"at": "29.0.4", "status": "unaffected"}], "version": "17.0", "lessThan": "*", "versionType": "otp"}], "packageURL": "pkg:software-id/erlang.org/otp", "packageName": "otp", "programFiles": ["erts/epmd/src/epmd_srv.c"], "defaultStatus": "unaffected", "programRoutines": [{"name": "do_accept"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["epmd_srv"], "product": "OTP", "versions": [{"status": "affected", "changes": [{"at": "15.2.7.11", "status": "unaffected"}, {"at": "16.4.0.4", "status": "unaffected"}, {"at": "17.0.4", "status": "unaffected"}], "version": "6.0", "lessThan": "*", "versionType": "otp"}], "packageURL": "pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git", "packageName": "erts", "programFiles": ["epmd/src/epmd_srv.c"], "defaultStatus": "unaffected", "programRoutines": [{"name": "do_accept"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "modules": ["epmd_srv"], "product": "OTP", "versions": [{"status": "affected", "version": "07b8f441ca711f9812fad9e9115bab3c3aa92f79", "lessThan": "865d203e4a6a8f44179eced9e1428f9259e4a3bb", "versionType": "git"}], "packageURL": "pkg:github/erlang/otp", "packageName": "erlang/otp", "programFiles": ["erts/epmd/src/epmd_srv.c"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "do_accept"}]}], "datePublic": "2026-07-27T14:58:24.000Z", "references": [{"url": "https://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6", "name": "epmd: Denial-of-service via accept(EMFILE)", "tags": ["vendor-advisory", "related"]}, {"url": "https://cna.erlef.org/cves/CVE-2026-42792.html", "name": "EEF CNA record for CVE-2026-42792", "tags": ["related"]}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-42792", "name": "OSV record EEF-CVE-2026-42792", "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/07b8f441ca711f9812fad9e9115bab3c3aa92f79", "name": "Introducing commit 07b8f44 in erlang/otp", "tags": ["related"]}, {"url": "https://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb", "name": "Fix commit 865d203 in erlang/otp", "tags": ["patch"]}], "workarounds": [{"lang": "en", "value": "* Restrict epmd to loopback only by adding a systemd socket override: set ListenStream= (empty, to clear), then ListenStream=127.0.0.1:4369 and ListenStream=[::1]:4369 in /etc/systemd/system/epmd.socket.d/override.conf.\n* On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding LimitNOFILE=65536 and Restart=always with a suitable RestartSec in /etc/systemd/system/epmd.service.d/override.conf.\n* Restrict network access to TCP port 4369 via firewall rules to trusted hosts only.", "supportingMedia": [{"type": "text/html", "value": "<ul>\n<li>Restrict epmd to loopback only by adding a systemd socket override: set <code>ListenStream=</code> (empty, to clear), then <code>ListenStream=127.0.0.1:4369</code> and <code>ListenStream=[::1]:4369</code> in <code>/etc/systemd/system/epmd.socket.d/override.conf</code>.</li>\n<li>On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding <code>LimitNOFILE=65536</code> and <code>Restart=always</code> with a suitable <code>RestartSec</code> in <code>/etc/systemd/system/epmd.service.d/override.conf</code>.</li>\n<li>Restrict network access to TCP port 4369 via firewall rules to trusted hosts only.</li>\n</ul>", "base64": false}, {"type": "text/markdown", "value": "* Restrict epmd to loopback only by adding a systemd socket override: set `ListenStream=` (empty, to clear), then `ListenStream=127.0.0.1:4369` and `ListenStream=[::1]:4369` in `/etc/systemd/system/epmd.socket.d/override.conf`.\n* On systemd-managed systems, raise the file descriptor limit and configure automatic restart by adding `LimitNOFILE=65536` and `Restart=always` with a suitable `RestartSec` in `/etc/systemd/system/epmd.service.d/override.conf`.\n* Restrict network access to TCP port 4369 via firewall rules to trusted hosts only.", "base64": false}]}], "descriptions": [{"lang": "en", "value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit() when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, OTP\u00a028.5.0.4, and OTP\u00a029.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4.", "supportingMedia": [{"type": "text/html", "value": "<p>Improper Handling of Exceptional Conditions vulnerability in Erlang OTP <code>erts</code> (<code>epmd</code>) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.</p>\n<p>The <code>do_accept</code> function in <code>erts/epmd/src/epmd_srv.c</code> calls <code>epmd_cleanup_exit()</code> when <code>accept(2)</code> returns <code>EMFILE</code> (per-process file descriptor limit reached) or <code>ENFILE</code> (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing <code>accept(2)</code> to return <code>EMFILE</code>, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.</p>\n<p>On Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both <code>epmd.service</code> and <code>epmd.socket</code> and requiring manual operator intervention to recover.</p>\n<p>This issue affects OTP from OTP&nbsp;17.0 before OTP&nbsp;27.3.4.15, OTP&nbsp;28.5.0.4, and OTP&nbsp;29.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4.</p>", "base64": false}, {"type": "text/markdown", "value": "Improper Handling of Exceptional Conditions vulnerability in Erlang OTP `erts` (`epmd`) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion.\n\nThe `do_accept` function in `erts/epmd/src/epmd_srv.c` calls `epmd_cleanup_exit()` when `accept(2)` returns `EMFILE` (per-process file descriptor limit reached) or `ENFILE` (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing `accept(2)` to return `EMFILE`, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both `epmd.service` and `epmd.socket` and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, OTP\u00a028.5.0.4, and OTP\u00a029.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-755", "description": "CWE-755 Improper Handling of Exceptional Conditions"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "27.3.4.15", "versionStartIncluding": "17.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "28.5.0.4", "versionStartIncluding": "28.0"}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "29.0.4", "versionStartIncluding": "29.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-11T19:09:12.847Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42792", "state": "PUBLISHED", "dateUpdated": "2026-11-11T19:09:12.847Z", "dateReserved": "2026-04-29T18:06:33.251Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-07-27T14:58:24.426Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source.\n\nOn Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, OTP\u00a028.5.0.4, and OTP\u00a029.0.4, corresponding to erts from 6.0 before 15.2.7.11, 16.4.0.4, and 17.0.4."}, {"lang": "es", "value": "La \u201cvulnerabilidad\u201d de manejo inadecuado de condiciones excepcionales en Erlang OTP erts (epmd) permite a un \u201catacante\u201d remoto no autenticado terminar permanentemente el demonio mapeador de \u201cpuertos\u201d de Erlang (epmd) mediante el agotamiento de ranuras de conexi\u00f3n.\n\nLa funci\u00f3n do_accept en erts/epmd/src/epmd_srv.c llama a epmd_cleanup_exit() cuando accept(2) devuelve EMFILE (l\u00edmite de descriptores de archivo por proceso alcanzado) o ENFILE (l\u00edmite de descriptores de archivo a nivel de sistema alcanzado), en lugar de tratar estas como condiciones recuperables. Un \u201catacante\u201d puede agotar las ranuras de descriptores de archivo de epmd manteniendo muchas conexiones TCP abiertas mientras env\u00eda peri\u00f3dicamente un solo byte para restablecer el tiempo de espera de inactividad, luego haciendo que accept(2) devuelva EMFILE, lo que mata al demonio. epmd no tiene un l\u00edmite de conexi\u00f3n por IP de origen, lo que hace que el ataque sea factible desde una \u00fanica fuente.\n\nEn el empaquetado predeterminado de Debian/Ubuntu, el \u201cimpacto\u201d se amplifica: la unidad systemd hereda un l\u00edmite flexible bajo de descriptores de archivo, y las muertes repetidas del demonio activan el l\u00edmite de tasa de inicio de systemd, fallando permanentemente tanto epmd.service como epmd.socket y requiriendo la intervenci\u00f3n manual del operador para recuperarse.\n\nEste problema afecta a OTP desde OTP 17.0 antes de OTP 29.0.4, OTP 28.5.0.4 y OTP 27.3.4.15."}], "id": "CVE-2026-42792", "lastModified": "2026-11-11T19:17:40.460", "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": 6.3, "baseSeverity": "MEDIUM", "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:L/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": "LOW", "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-2026-42792", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-27T17:25:58.879765Z", "version": "2.0.3"}}]}, "published": "2026-07-27T16:17:06.257", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch", "Third Party Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-42792.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/erlang/otp/commit/07b8f441ca711f9812fad9e9115bab3c3aa92f79"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Vendor Advisory"], "url": "https://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch", "Third Party Advisory"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-42792"}, {"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-755"}, {"lang": "en", "value": "CWE-770"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{"bugzilla": {"description": "erlang-otp: epmd: Erlang OTP epmd: Remote Denial of Service via connection exhaustion", "id": "2507551", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507551"}, "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-253", "details": ["A flaw was found in Erlang OTP's Erlang Port Mapper Daemon (epmd). An unauthenticated remote attacker can exploit an improper handling of exceptional conditions in the do_accept function. By exhausting connection slots through holding numerous TCP connections open and periodically sending data, the attacker can force epmd to terminate, leading to a permanent Denial of Service (DoS). This can further impact system stability on certain Linux distributions by causing related services to fail permanently."], "name": "CVE-2026-42792", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-27T14:58:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-42792\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42792\nhttps://cna.erlef.org/cves/CVE-2026-42792.html\nhttps://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb\nhttps://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6\nhttps://osv.dev/vulnerability/EEF-CVE-2026-42792\nhttps://www.erlang.org/doc/system/versions.html#order-of-versions"], "threat_severity": "Important"}

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