| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/tektoncd/pipeline | ≥ 1.0.0, < 1.0.2≥ 1.1.0, < 1.3.4≥ 1.10.0, < 1.11.1≥ 1.2.0, < 1.3.4≥ 1.4.0, < 1.6.2≥ 1.7.0, < 1.9.3 | 1.0.21.3.41.11.11.6.21.9.3 |
| tekton pipelines | ≥ 1.0.0, ≤ 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.
The git resolver's ResolveAPIGit() function in pkg/resolution/resolver/git/resolver.go constructs an SCM client using the user-supplied serverURL and a token obtained via getAPIToken().
When the user provides serverURL but omits the token parameter:
getSCMTypeAndServerURL() reads serverURL directly from user params (params[ServerURLParam]) with no validation against the system-configured URL.
secretRef is set to nil because the user did not provide a token parameter.
getAPIToken(ctx, nil, APISecretNameKey) is called. It detects apiSecret == nil, creates a new secretCacheKey, and populates it from the system-configured secret (conf.APISecretName / conf.APISecretNamespace / SYSTEM_NAMESPACE).
clientFunc(scmType, serverURL, string(apiToken)) creates an SCM client pointed at the attacker-controlled URL with the system token. The SCM factory sets the token as an Authorization header on the HTTP client.
All subsequent API calls (Contents.Find, Git.FindCommit) carry the system token to the attacker URL.
The system Git API token (GitHub PAT, GitLab token, etc.) is exfiltrated to an attacker-controlled endpoint. This token typically has read access to private repositories containing source code, secrets, and CI/CD configurations.
This follows the same threat model as GHSA-j5q5-j9gm-2w5c (published March 2026): a namespace-scoped tenant with permission to create TaskRuns exploits the git resolver to exfiltrate credentials. The prior advisory involved reading the resolver pod's ServiceAccount token via path traversal. This finding involves redirecting the system Git API token via serverURL.
Fixed in:
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site freeThe fix validates that when serverURL is user-provided and differs from the system-configured server URL, the user must also provide their own token parameter. Using the system token with a non-system server URL is rejected.
token parameter.NetworkPolicy to the tekton-pipelines-resolvers namespace to restrict outbound traffic to known-good Git servers only.All releases from v1.0.0 through v1.10.0, including all patch releases. The API mode of the git resolver has been present since the resolver was introduced.
Releases prior to v1.0.0 are not affected because the git resolver either did not exist or did not have API mode.
This vulnerability was reported by Koda Reef (@kodareef5), who provided a detailed analysis and proof-of-concept. Thank you!
api-token-secret-namespace)