Vulnerability Description
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, the git resolver's revision parameter is passed directly as a positional argument to git fetch without any validation that it does not begin with a - character. Because git parses flags from mixed positional arguments, an attacker can inject arbitrary git fetch flags such as --upload-pack=<binary>. Combined with the validateRepoURL function explicitly permitting URLs that begin with / (local filesystem paths), a tenant who can submit ResolutionRequest objects can chain these two behaviors to execute an arbitrary binary on the resolver pod. The tekton-pipelines-resolvers ServiceAccount holds cluster-wide get/list/watch on all Secrets, so code execution on the resolver pod enables full cluster-wide secret exfiltration. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Tekton Pipelines | >= 1.0.0, < 1.11.0 |
Related Weaknesses (CWE)
References
- https://github.com/tektoncd/pipeline/releases/tag/v1.11.1Release Notes
- https://github.com/tektoncd/pipeline/security/advisories/GHSA-94jr-7pqp-xhcqExploitVendor Advisory
- https://github.com/tektoncd/pipeline/security/advisories/GHSA-94jr-7pqp-xhcqExploitVendor Advisory
FAQ
What is CVE-2026-40938?
CVE-2026-40938 is a vulnerability with a CVSS score of 7.5 (HIGH). Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, the git resolver's re...
How severe is CVE-2026-40938?
CVE-2026-40938 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40938?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Tekton Pipelines.