TI-2026-29050 Aliases CVE-2026-40256 GHSA-ffgh-3jrf-8wvh

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

LOW 23CWE-22Published 2026-04-15 · Updated 2026-04-16

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00324 25th percentileScored 2026-11-07

Fix Fixed weblate (WeblateOrg): 5.17weblate (PyPI): 5.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
WeblateOrg	weblate	before 5.17	5.17	Patch available	CNA
—	weblate (PyPI)	before 5.17	5.17	Patch available	GHSA-ffgh-3jrf-8wvh

weblate VendorWeblateOrg Affected before 5.17 Fixed in 5.17 Patch available CNA
weblate (PyPI) Vendor— Affected before 5.17 Fixed in 5.17 Patch available GHSA-ffgh-3jrf-8wvh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:weblate:weblate::::::::	before 5.17	Vulnerable	WeblateOrg

cpe:2.3:a:weblate:weblate:*:*:*:*:*:*:*:* Versions before 5.17 Vulnerable ·WeblateOrg

Remediation

Fix · CNA weblate (WeblateOrg) Fixed in 5.17
Fix · GHSA-ffgh-3jrf-8wvh weblate (PyPI) Fixed in 5.17 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-40256
2026-10-03 Alias added: GHSA-ffgh-3jrf-8wvh

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-40256

Other 2

TI-2025-23145 Weblate VCS credentials included in URL parameters are potentially logged and saved into browser history as plaintext CVSS 3.1HIGH 7.5
TI-2025-38033 Weblate integration with Anubis can lead to Open Redirect via redir parameter CVSS 4.0LOW 2.1
TI-2022-07893 Remote code execution (RCE) in Weblate CVSS 3.1HIGH 8.8
TI-2025-41967 Weblate has git config file overwrite vulnerability that leads to remote code execution CVSS 3.1CRITICAL 9.1
TI-2026-26679 Weblate: Privilege escalation in the user API endpoint CVSS 3.1HIGH 8.8
TI-2026-19444 Weblate has an argument injection in management console CVSS 3.1CRITICAL 9.1

See all 32 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences