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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (35.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
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
- github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff (Vendor Advisory)
- github.com/tektoncd/pipeline/issues/9608 (Issue Tracking)
- github.com/tektoncd/pipeline/issues/9609 (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.