> CVE-2026-42792 [MEDIUM]

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PUBLISHED
2026-07-27 16:17
MODIFIED
2026-07-27 16:17
CVSS_SCORE V3
6.3
EPSS (Prob. Exploit)
0.43%
Top 62.2%
DATA SOURCES:
NVD đź”— 2026-07-27 RED HAT đź”— 2026-08-09 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 OSV đź”— 2026-10-26 MSRC đź”— 2026-11-02

> DESCRIPTION

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. 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.

> AFFECTED_PRODUCTS

Red Hat - Red Hat Hardened Images
Version: 27.3.4.15

> CVSS V3 METRICS

CVSS_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

> MÉTRIQUES CVSS DÉTAILLÉES

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
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-755 CWE-770

> CWE DETAILED DESCRIPTIONS

CWE-755: Improper Handling of Exceptional Conditions - The product does not handle or incorrectly handles an exceptional condition. | CWE-770: Allocation of Resources Without Limits or Throttling - The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
An update for Red Hat Hardened Images RPMs is now available.

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

epmd permanent DoS via EMFILE on accept(2) in erts

AFFECTED PACKAGES:
Unknown / Unknown
54 versions affected
ALIASES:
EEF-CVE-2026-42792, GHSA-h6f3-hx58-xhj6

> HISTORIQUE DES MODIFICATIONS

Première apparition
27/07/2026 16:17
Source: NVD
đź“Š ENRICHISSEMENT 09/08/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Important" }
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
đź“Š ENRICHISSEMENT 02/08/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
đź“Š ENRICHISSEMENT 02/08/2026 05:02
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-755: Improper Handling of Exceptional Conditions - The product does not handle or incorrectly handles an exceptional condition. | CWE-770: Allocation of Resources Without Limits or Throttling - Th...
Total des modifications: 4 Dernière mise à jour: 2 months ago

> REFERENCES

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
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