SB2026040126 - Path traversal in Dovecot

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Main Vulnerability Database SB2026040126

SB2026040126 - Path traversal in Dovecot

Published: April 1, 2026

Security Bulletin ID SB2026040126
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: CVE-2026-0394)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper limitation of a pathname to a restricted directory ('Path Traversal') in passwd-file passdb when processing domain-based authentication requests. A remote attacker can send a specially crafted request with malicious domain parameter to disclose sensitive information.

The server must be configured to use per-domain passwd files placed one path component above /etc or with slash in allowed characters.


Remediation

Install update from vendor's website.

References