CVE-2026-40256 MEDIUM

CVE-2026-40256: Weblate: Prefix-Based Repository Boundary Check Bypass via Symlink/Junction Path Prefix Collision

Vendor Weblateorg
Product weblate
Weakness CWE-22 · Path traversal
Published April 15, 2026
Last update April 16, 2026

CVSS base score

5.0/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

What the vulnerability does

01Description

Weblate is a web based localization tool. In versions prior to 5.17, repository-boundary validation relies on string prefix checks on resolved absolute paths. In multiple code paths, the check uses startswith against the repository root path. This is not path-segment aware and can be bypassed when the external path shares the same string prefix as the repository path (for example, repo and repo_outside). This issue has been fixed in version 5.17.

Key dates

02Disclosure timeline

April 15, 2026 CVE published
April 16, 2026 Record updated