Vulnerability in Linuxfoundation Tekton Pipelines
CVE-2026-40161
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.
EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Linuxfoundation Tekton_pipelines
- Tektoncd Pipeline — versions >= 1.4.0, < 1.6.2, >= 1.2.0, < 1.3.4, >= 1.7.0, < 1.9.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2026-40161?
- CVE-2026-40161 is a high-severity vulnerability in Linuxfoundation Tekton Pipelines, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 7.7/10. Published 2026-04-21.
- How severe is CVE-2026-40161?
- High severity. CVSS v3 base score is 7.7 out of 10.