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CVE-2026-40686

LOW

3.7

Descricao

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.

Detalhes CVE

Pontuacao CVSS v3.13.7

SeveridadeLOW

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

Vetor de ataqueNETWORK

ComplexidadeHIGH

Privilegios necessariosNONE

Interacao do usuarioNONE

Publicado4/30/2026

Ultima modificacao5/1/2026

Fontenvd

Avistamentos honeypot0

Produtos afetados

exim:exim

Fraquezas (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)

Correlacoes IOC

Sem correlacoes registradas

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