tektoncd pipeline up to 1.11.0 validateRepoURL argument injection

Summaryinfo

A vulnerability was found in tektoncd pipeline up to 1.11.0. It has been rated as critical. Affected by this vulnerability is the function validateRepoURL. Performing a manipulation results in argument injection. This vulnerability was named CVE-2026-40938. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in tektoncd pipeline up to 1.11.0. This affects the function validateRepoURL. The manipulation with an unknown input leads to a argument injection vulnerability. CWE is classifying the issue as CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 1.0.0 to before 1.11.0, 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. This vulnerability is fixed in 1.11.1.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-40938 since 04/15/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 1.11.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• tektoncd

Name

• pipeline

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11.0

Website

• Product: https://github.com/tektoncd/pipeline/

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