CVE-2026-24031
8.2
HIGH
CVSS 3.1
EPSS 0.03%
Description
Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.
How to fix CVE-2026-24031
To remediate CVE-2026-24031, upgrade the affected package to a fixed version below.
- Alpine/dovecot—upgrade to 2.4.3-r0 or later
- —upgrade to 1:2.4.1+dfsg1-6+deb13u4 or later
Is CVE-2026-24031 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, < 1:2.4.1+dfsg1-6+deb13u4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |