CVE-2026-40938

Summary

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.

Affected Software

VendorProductVersion RangeStatus
tektoncdpipeline>= 1.0.0, < 1.0.2affected
tektoncdpipeline>= 1.2.0, < 1.3.4affected
tektoncdpipeline>= 1.4.0, < 1.6.2affected
tektoncdpipeline>= 1.7.0, < 1.9.3affected
tektoncdpipeline>= 1.10.0, < 1.11.1affected

Weaknesses

  • CWE-88: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: total

Additional References

github.com/tektoncd/pipeline: Tekton Pipelines: Arbitrary code execution and secret exfiltration via malicious git commands

Additional References

References