CVE Watch28 ago 2026

CVE-2026-40013

An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write

CVSS

4.3

Medio

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 28 ago 2026 · Última mod.: 28 ago 2026 · CWE-124

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for script management. This might be able to be used for remote code execution. Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version. No publicly available exploits are known.

Referencias oficiales

documentation.open-xchange.comhttps://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

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