Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL

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 Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled serverURL when the user omits the token parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing serverURL to an attacker-controlled endpoint. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Timeline

1. Apr 21, 2026, 4:26 PM UTCCVE published
2. Apr 21, 2026, 5:41 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. May 21, 2026, 9:20 PM UTCRecord last updated

Affected versions

• tektoncd pipeline

  From 1.0.0 · fixed in 1.0.2; From 1.2.0 · fixed in 1.3.4; From 1.4.0 · fixed in 1.6.2; From 1.7.0 · fixed in 1.9.3; From 1.10.0 · fixed in 1.11.1

• github.com/tektoncd/pipelineGo

  From 1.0.0 · fixed in 1.0.2; From 1.1.0 · fixed in 1.3.4; From 1.4.0 · fixed in 1.6.2; From 1.7.0 · fixed in 1.9.3; From 1.10.0 · fixed in 1.11.1

• github.com/tektoncd/pipelineGo

  From 1.0.0 · fixed in 1.0.2

• github.com/tektoncd/pipelineGo

  From 1.2.0 · fixed in 1.3.4

• github.com/tektoncd/pipelineGo

  From 1.4.0 · fixed in 1.6.2

• github.com/tektoncd/pipelineGo

  From 1.7.0 · fixed in 1.9.3

• github.com/tektoncd/pipelineGo

  From 1.10.0 · fixed in 1.11.1

References 3