CVE-2026-45807 – Kestra: Path traversal via URL-encoded “%2E%2E” in execution and namespace file endpoints allows arbitrary file read

CVE ID :CVE-2026-45807

Published : June 26, 2026, 8:57 p.m. | 47 minutes ago

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.

Severity: 0.0 | NA

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