Arbitrary Argument Injection Affecting tkn package, versions <0.44.1-r4


Severity

Recommended
0.0
high
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.04% (11th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-WOLFILATEST-TKN-16535096
  • published8 May 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 tkn to version 0.44.1-r4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tkn package and not the tkn 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