CVE-2026-40161
Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL
Description
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.
INFO
Published Date :
April 21, 2026, 5:16 p.m.
Last Modified :
April 24, 2026, 8:55 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Tekton Pipelines to version 1.10.1 or later.
- Ensure Git API tokens are properly managed.
- Limit TaskRun and PipelineRun creation permissions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40161.
| URL | Resource |
|---|---|
| https://github.com/tektoncd/pipeline/issues/9608 | Issue Tracking |
| https://github.com/tektoncd/pipeline/issues/9609 | Issue Tracking |
| https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40161 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40161
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40161 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40161 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 24, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:* versions from (including) 1.0.0 up to (including) 1.10.0 Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/issues/9608 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/issues/9609 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 21, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Added CWE CWE-201 Added Reference https://github.com/tektoncd/pipeline/issues/9608 Added Reference https://github.com/tektoncd/pipeline/issues/9609 Added Reference https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff