CVE-2026-42792
Estado: AnalizadaMedia (6.3)—
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.
The 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.
Leer descripción completaMostrar menos
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.
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 epmd.service and epmd.socket and requiring manual operator intervention to recover.
This issue affects OTP from OTP 17.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15.
CVSS
- Versión: 4.0
- Vector: 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
- Puntuación base: 6.3
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.43%
- Percentil entre todas las CVEs puntuadas: 36
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-755, CWE-770
Referencias
- https://cna.erlef.org/cves/CVE-2026-42792.html
- https://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb
- https://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6
- https://osv.dev/vulnerability/EEF-CVE-2026-42792
- https://www.erlang.org/doc/system/versions.html#order-of-versions
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-42792",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-42792",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-07-27T17:25:58.879765Z"
}
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
],
"cvssMetricV40": [
{
"type": "Secondary",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"cvssData": {
"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/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",
"exploitMaturity": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "NONE",
"subIntegrityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"vulnAvailabilityImpact": "LOW",
"availabilityRequirement": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"subConfidentialityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"confidentialityRequirement": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED"
}
}
]
},
"affected": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"affectedData": [
{
"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": "17.0.4",
"status": "unaffected"
},
{
"at": "16.4.0.4",
"status": "unaffected"
},
{
"at": "15.2.7.11",
"status": "unaffected"
}
],
"version": "6.0",
"lessThan": "*",
"versionType": "otp"
}
],
"packageURL": "pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%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",
"changes": [
{
"at": "29.0.4",
"status": "unaffected"
},
{
"at": "28.5.0.4",
"status": "unaffected"
},
{
"at": "27.3.4.15",
"status": "unaffected"
}
],
"version": "17.0",
"lessThan": "*",
"versionType": "otp"
},
{
"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"
}
]
}
]
}
],
"published": "2026-07-27T16:17:06.257",
"references": [
{
"url": "https://cna.erlef.org/cves/CVE-2026-42792.html",
"tags": [
"Patch",
"Third Party Advisory"
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb",
"tags": [
"Patch"
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6",
"tags": [
"Vendor Advisory"
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-42792",
"tags": [
"Patch",
"Third Party Advisory"
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions",
"tags": [
"Release Notes"
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Secondary",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"description": [
{
"lang": "en",
"value": "CWE-755"
},
{
"lang": "en",
"value": "CWE-770"
}
]
}
],
"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 17.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15."
}
],
"lastModified": "2026-08-10T20:26:36.763",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "10384C63-57E8-4397-AE79-E964B7BD34F6",
"versionEndExcluding": "27.3.4",
"versionStartIncluding": "17.0"
},
{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E5A403B9-F8C0-42F9-9CDD-AE95FBBA58BC",
"versionEndExcluding": "28.5.0.4",
"versionStartIncluding": "28.0"
},
{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4325E198-43FA-4DD1-99A5-66705CF21615",
"versionEndExcluding": "29.0.4",
"versionStartIncluding": "29.0"
},
{
"criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "076E547B-651B-4CE7-B0D1-FC9F00E87794",
"versionEndExcluding": "15.2.7.11",
"versionStartIncluding": "6.0"
},
{
"criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "31D9076A-4078-4597-A518-12B6E55007B8",
"versionEndExcluding": "16.4.0.4",
"versionStartIncluding": "16.0"
},
{
"criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7EC53F68-5A92-4EF5-8789-1905C50D85BF",
"versionEndExcluding": "17.0.4",
"versionStartIncluding": "17.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}