Authentication Bypass Affecting dovecot-pgsql package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-RHEL6-DOVECOTPGSQL-15873909
  • published2 Apr 2026
  • disclosed27 Mar 2026

Introduced: 27 Mar 2026

NewCVE-2026-27855  (opens in a new tab)
CWE-294  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:6 dovecot-pgsql.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dovecot-pgsql package and not the dovecot-pgsql package as distributed by RHEL. See How to fix? for RHEL:6 relevant fixed versions and status.

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.

CVSS Base Scores

version 3.1