Path Traversal in Kestra
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (44.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Kestra
- Kestra-Io Kestra — versions < 1.0.43, >= 1.1.0, < 1.3.19
Weakness classification (CWE)
References
- github.com/kestra-io/kestra/security/advisories/GHSA-3529-p4wf-xp79 (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45807?
- CVE-2026-45807 is a high-severity vulnerability in Kestra, classified under Path Traversal. CVSS score: 7.7/10. Published 2026-06-26.
- How severe is CVE-2026-45807?
- High severity. CVSS v3 base score is 7.7 out of 10.