🛡️ CVE-2026-27851 on Alpine — dovecot

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.

Distribution advisory

This page covers CVE-2026-27851 as tracked by Alpine, for the package dovecot. The fix is available in version 2.4.4-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Affected software

ALPINE-CVE-2026-27851 is recorded against 1 package.

  • dovecot (fixed in 2.4.4-r0)

Timeline and source

Published on 12 May 2026 and last revised on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

CVE-2026-27851 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-12
Updated 2026-08-11
Modified 2026-08-05
Fix URL N/A

Affected Packages

Software From version Fixed in
dovecot — 2.4.4-r0

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