RCE in Kestra
CVE-2026-53576
Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter for the REST API (@Filter("/api/v1/**")) treats any request whose path ends in /configs as the public instance-config endpoint and forwards it without a credential check. kestra addresses its resources by URL path segments that the caller chooses (/api/v1/{tenant}/flows/{namespace}, /api/v1/{tenant}/executions/{namespace}/{id}, /api/v1/{tenant}/namespaces/{namespace}/kv/{key}). An anonymous caller picks the literal configs as the final segment, and the request bypasses Basic-Auth entirely. Because the bypass reaches the flow-create and execution-trigger routes, an unauthenticated caller creates a flow containing a Shell or Process task and runs it. The task executes as root inside the kestra container. The official docker-compose.yml mounts /var/run/docker.sock, so root in the container reaches the host Docker daemon. This vulnerability is fixed in 1.0.45 and 1.3.21.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.033 (88.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
- Kestra
- Kestra-Io Kestra — versions < 1.0.45, >= 1.1.0, < 1.3.21
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/kestra-io/kestra/security/advisories/GHSA-2q47-568g-9h4f (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-53576?
- CVE-2026-53576 is a critical-severity vulnerability in Kestra, classified under Code Injection. CVSS score: 10.0/10. Published 2026-06-26.
- How severe is CVE-2026-53576?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-53576 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.