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Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

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

High 7.7

In plain English

A high-severity security flaw in pipeline from tektoncd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.3%top 82.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/tektoncd/pipeline1.0.2GHSA-wjxp-xrpv-xpff
Gogithub.com/tektoncd/pipeline1.3.4GHSA-wjxp-xrpv-xpff
Gogithub.com/tektoncd/pipeline1.6.2GHSA-wjxp-xrpv-xpff
Gogithub.com/tektoncd/pipeline1.9.3GHSA-wjxp-xrpv-xpff
Gogithub.com/tektoncd/pipeline1.11.1GHSA-wjxp-xrpv-xpff
Gogithub.com/tektoncd/pipeline1.0.2, 1.11.1, 1.3.4, 1.6.2, 1.9.3GO-2026-5711

Affected products (as reported)

VendorProductVersions
tektoncd pipeline >= 1.0.0, < 1.0.2>= 1.2.0, < 1.3.4>= 1.4.0, < 1.6.2>= 1.7.0, < 1.9.3>= 1.10.0, < 1.11.1

Weakness: CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References