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CVE-2026-27858

high CVSS 7.5 EPSS 0.8%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-27858 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.8% probability of exploitation in the next 30 days, higher than 55% of scored vulnerabilities
Weakness
CWE-400
Published
2026-03-27
NVD CVE.org Advisory record

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