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CVE-2026-40686

LOW

3.7

Descripcion

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present (malformed UTF-8 header data). Information might be divulged within an error message produced during handling of an unrelated e-mail message.

Detalles CVE

Puntuacion CVSS v3.13.7

SeveridadLOW

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

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-125

Referencias

https://code.exim.org/exim/exim/commit/f2570bde16fb4d4a1242ff363a4c4eecf6372efc(cve@mitre.org)

https://exim.org/static/doc/security/CVE-2026-40686.txt(cve@mitre.org)

https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40686.assessment(cve@mitre.org)

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

Correlaciones IOC

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