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CVE-2026-40016

medium CVSS 5.3 EPSS 0.3%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-40016 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
0.3% probability of exploitation in the next 30 days, higher than 27% of scored vulnerabilities
Weakness
CWE-400
Published
2026-05-12
NVD CVE.org

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