CVE-2026-45807
Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.43 and 1.3.19, several Kestra API endpoints accept a kestra:// URI from the client and pass it through StorageInterface.parentTraversalGuard before reading the underlying file from the local storage backend. The guard only inspects the literal URI.toString(), so a URL-encoded .. written as %2E%2E slips through. The downstream code then calls URI.getPath(), which decodes %2E%2E back to .., and the resulting path is handed to Paths.get(...) without normalization. The OS resolves the .. segments at open(2) time, so an authenticated user with a single execution can read any file the Kestra process has access to on the host filesystem (/etc/passwd, mounted secrets, other tenants' execution outputs, etc.). This vulnerability is fixed in 1.0.43 and 1.3.19.
- Score
- CVSS 3.1 7.7 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-06-26
- Last modified
- 2026-10-25
- Weaknesses
- CWE-22
Affected products
References
- https://github.com/kestra-io/kestra/security/advisories/GHSA-3529-p4wf-xp79
