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CVE-2026-40016

6.5 medium SSVC exploitation: none Analyzed
NVD · CVE.org

Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 6.5 · dovecot, open-xchangeNVD modified 2026-10-26 18:10

Affected (CPE criteria) 2

  • cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
  • cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*

References 1