tektoncd pipeline up to 1.10.0 insertion of sensitive information into sent data

Summaryinfo

A vulnerability was found in tektoncd pipeline up to 1.10.0. It has been rated as problematic. The impacted element is an unknown function. This manipulation causes insertion of sensitive information into sent data. The identification of this vulnerability is CVE-2026-40161. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in tektoncd pipeline up to 1.10.0 and classified as problematic. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. The CWE definition for the vulnerability is CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-40161 since 04/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/22/2026). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-24165). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• tektoncd

Name

• pipeline

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10.0

Website

• Product: https://github.com/tektoncd/pipeline/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion