What’s Vulnerable › Vulnerabilities

CVE-2026-40161: Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-21 · updated 2026-10-26
• Weakness: CWE-201

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 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.

Affected products

• tektoncd pipeline: from 1.0.0 through 1.10.0

References

• https://github.com/tektoncd/pipeline/issues/9608
• https://github.com/tektoncd/pipeline/issues/9609
• https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff

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