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CVE-2026-27856

high CVSS 7.4 EPSS 0.4%

Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.

Versions it affects

Software versions checked with the free lookup that CVE-2026-27856 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
7.4 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 33% of scored vulnerabilities
Weakness
CWE-208
Published
2026-03-27
NVD CVE.org Advisory record

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