CVE-2026-45807: Kestra

High severity, CVSS 7.7. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Kestra Kestra: before 1.0.43 (fixed in 1.0.43); from 1.1.0, before 1.3.19 (fixed in 1.3.19)

Published 2026-06-26. Last modified 2026-07-01.