medium5.0
CVE-2026-40256
Weblate: Prefix-Based Repository Boundary Check Bypass via Symlink/Junction Path Prefix Collision
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | weblate | < 5.17 | 5.17 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Weblate | Weblate | before 5.17 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-ffgh-3jrf-8wvh
- https://github.com/WeblateOrg/weblate/security/advisories/GHSA-ffgh-3jrf-8wvh
- https://nvd.nist.gov/vuln/detail/CVE-2026-40256
- https://github.com/WeblateOrg/weblate/pull/18847
- https://github.com/WeblateOrg/weblate/commit/e30dbcb33ae78e754ecef192d54f996b89cb4e15