CVE-2026-40684

MEDIUM

5.9

Descripcion

In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.

Detalles CVE

Puntuacion CVSS v3.15.9

SeveridadMEDIUM

Vector CVSSCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vector de ataqueNETWORK

ComplejidadHIGH

Privilegios requeridosNONE

Interaccion usuarioNONE

Publicado4/30/2026

Ultima modificacion5/1/2026

Fuentenvd

Avistamientos honeypot0

Productos afectados

exim:exim

Debilidades (CWE)

CWE-684

Referencias

https://code.exim.org/exim/exim/commit/628bbaca7672748d941a12e7cd5f0122a4e18c81(cve@mitre.org)

https://exim.org/static/doc/security/CVE-2026-40684.txt(cve@mitre.org)

https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40684.assessment(cve@mitre.org)

https://www.openwall.com/lists/oss-security/2026/04/30/21(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2026/05/01/11(af854a3a-2127-422b-91ae-364da2661108)

Correlaciones IOC

Sin correlaciones registradas

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