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Vulnerability DatabaseCVE-2026-27858

CVE-2026-27858: 
Dovecot vulnerability analysis and mitigation

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.

Source: NVD

Related Dovecot vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-27858HIGH7.5
  • DovecotDovecot
  • dovecot-mysql
NoYesMar 27, 2026
CVE-2026-27856HIGH7.4
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026
CVE-2026-27859MEDIUM5.3
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026
CVE-2026-27857MEDIUM4.3
  • DovecotDovecot
  • dovecot-pigeonhole
NoYesMar 27, 2026
CVE-2026-27860LOW3.7
  • DovecotDovecot
  • dovecot
NoYesMar 27, 2026

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