Arbitrary Argument Injection Affecting tekton-chains package, versions <0.26.3-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-WOLFILATEST-TEKTONCHAINS-16134592
  • published23 Apr 2026
  • disclosed21 Apr 2026

Introduced: 21 Apr 2026

CVE-2026-40938  (opens in a new tab)
CWE-88  (opens in a new tab)

How to fix?

Upgrade Wolfi tekton-chains to version 0.26.3-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tekton-chains package and not the tekton-chains package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

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 Base Scores

version 3.1