CVE-2026-27851

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.

Affected products

Dovecot, Linuxmint, Ubuntu

Dovecot

< 2.4.4

Open-xchange Dovecot

< 3.1.5

Fix

Available

CVSS 3.1

9.1 CRITICAL

EPSS

0.4% (34th percentile)

Weakness

CWE-235, CWE-89

NVD status

Modified

Published

2026-05-12

No exploit for CVE-2026-27851 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.