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CVE-2026-27858

7.5 high SSVC exploitation: none Modified
NVD · CVE.org

Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. 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 7.5 · dovecot, open-xchangeNVD modified 2026-10-26 21:10

Affected (CPE criteria) 2

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

References 18