SB2026040126 - Path traversal in Dovecot
Published: April 1, 2026
Security Bulletin ID
SB2026040126
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Path traversal (CVE-ID: CVE-2026-0394)
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.