CVE-2026-40161 PUBLISHED

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

Assigner: GitHub_M
Reserved: 09.04.2026 Published: 21.04.2026 Updated: 21.04.2026

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 1.0.0 to 1.10.0, 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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS Score: 7.7

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	tektoncd
Product	pipeline
Versions	Version >= 1.0.0, <= 1.10.0 is affected

References

Problem Types

CWE-201: Insertion of Sensitive Information Into Sent Data CWE