CVE-2026-45807 Kestra: Path traversal via URL-encoded "%2E%2E" in execution and namespace file endpoints allows arbitrary file read
An authenticated user can read arbitrary files on the host filesystem via URL-encoded path traversal in Kestra API endpoints.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45807?
CVE-2026-45807 is a high-severity path traversal vulnerability in kestra-io kestra, published on 26 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-45807?
It affects 1 product.
Products include Kestra Kestra.
How do I fix CVE-2026-45807?
No fix has been published for CVE-2026-45807 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-45807 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45807 exists.
Other vulnerabilities in kestra-io kestra
- CVE-2026-49869 Kestra OSS OS Command Injection
- CVE-2026-53576 Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass
- CVE-2026-34612 Kestra: Remote Code Execution via SQL Injection
- CVE-2026-38428 SQL injection in n/a
- CVE-2026-55069 Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack
Sources
Also known as GHSA-3529-p4wf-xp79.