CVE-2026-27856
5.9
MEDIUM
CVSS 3.1
EPSS 0.03%
Description
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.
How to fix CVE-2026-27856
To remediate CVE-2026-27856, upgrade the affected package to a fixed version below.
- —upgrade to 2.4.3-r0 or later
- —upgrade to 1:2.3.13+dfsg1-2+deb11u3 or later
Is CVE-2026-27856 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.4.3-r0
- from 0, < 1:2.3.13+dfsg1-2+deb11u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |