CVE-2026-45807 Details
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.
A path traversal vulnerability has been identified in Kestra versions prior to 1.0.43 and 1.3.19. Several API endpoints accept a kestra:// URI from the client and pass it through a traversal guard before accessing files from the local storage backend. The guard only checks the literal URI string, allowing URL-encoded traversal sequences to bypass validation. This flaw enables authenticated users to read arbitrary files from the host filesystem, including sensitive data like /etc/passwd and other application secrets. The vulnerability arises because the URI path is decoded and passed to the file access methods without proper normalization, allowing the operating system to resolve the traversal segments and escape the intended storage directory.
Users can upgrade to Kestra versions 1.0.43 or 1.3.19, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/kestra-io/kestra/security/advisories/GHSA-3529-p4wf-xp79 | CISA-ADP | ExploitMitigationVendor Advisory |
| https://github.com/kestra-io/kestra/security/advisories/GHSA-3529-p4wf-xp79 | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| kestra kestra | < 1.0.43 >= 1.1.0, < 1.3.19 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 1, 2026 | Initial Analysis | [email protected] |
| Jun 29, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | New CVE Received | [email protected] |