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CVE-2026-27859

medium CVSS 5.3 EPSS 0.4%

A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.

Versions it affects

Software versions checked with the free lookup that CVE-2026-27859 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
Medium
CVSS base score
5.3 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 31% of scored vulnerabilities
Weakness
CWE-400
Published
2026-03-27
NVD CVE.org

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