CVE-2026-40161
HighSummary
In the Tekton Pipelines project, versions from 1.0.0 to 1.0.1 and 1.3.4, 1.6.2, 1.9.3, 1.11.1, the Git resolver in API mode sends the configured Git API token to a user-controlled serverURL when the token parameter is omitted. A user with TaskRun or PipelineRun create permissions can exfiltrate the shared API token.
Risk Assessment
The organization is at risk of API token theft, which could lead to unauthorized access to GitHub or GitLab resources. An attacker could use these tokens to gain control over the user's account.
Recommendation
It is recommended to upgrade to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, or 1.11.1 to mitigate this vulnerability. Additionally, consider restricting access to API parameters in the configuration.
Other vulnerabilities in Tekton Pipelines
See all- CVE-2026-33211Critical
A path traversal vulnerability in the Tekton Pipelines git resolver via the `pathInRepo` parameter allows tenants with `ResolutionRequests` creation permissions to read arbitrary files from the resolver pod's filesystem, including ServiceAccount tokens.
- CVE-2026-40938High
A vulnerability in Tekton Pipelines allows an attacker to inject flags into the git fetch command via the git resolver's revision parameter. Lack of validation that the parameter does not start with a hyphen enables arbitrary binary execution on the resolver pod. Combined with allowed local filesystem URLs, an attacker can escalate privileges and exfiltrate cluster-wide secrets.
- CVE-2023-37264Low
The Tekton Pipelines project does not validate child UIDs in version 0.35.0 and later, allowing users with access to create TaskRuns to create their own Tasks that the Pipelines controller accepts as child Tasks.
Original NVD description (English source)
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.