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High severity7.5NVD Advisory· Published Apr 21, 2026· Updated May 21, 2026

CVE-2026-40938

CVE-2026-40938

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=. 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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/tektoncd/pipelineGo
>= 1.10.0, < 1.11.11.11.1
github.com/tektoncd/pipelineGo
>= 1.7.0, < 1.9.31.9.3
github.com/tektoncd/pipelineGo
>= 1.4.0, < 1.6.21.6.2
github.com/tektoncd/pipelineGo
>= 1.2.0, < 1.3.41.3.4
github.com/tektoncd/pipelineGo
>= 1.0.0, < 1.0.21.0.2

Affected products

125

Patches

Vulnerability mechanics

References

4

News mentions

0

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