CVE-2026-40161

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

MEDIUM

6.5

CVSS Score

Published: April 21, 2026 at 04:26 PM UTC

Updated: October 26, 2026 at 09:10 PM UTC

2 products affected across 2 vendorsTekton PipelinesPipeline

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tekton Pipelines · Linuxfoundationgo

95%

1.0.0 ≤ v ≤ 1.10.0

Pipeline · Tektoncdgo

90%

1.0.0 ≤ v < 1.0.21.10.0 ≤ v < 1.11.11.2.0 ≤ v < 1.3.41.4.0 ≤ v < 1.6.21.7.0 ≤ v < 1.9.3

Affected range stops below 1.0.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.11.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.6.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.9.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff

References (3)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff

x_refsource_MISCIssue Tracking

Source: cverecord

https://github.com/tektoncd/pipeline/issues/9608

x_refsource_MISCIssue Tracking

Source: cverecord

https://github.com/tektoncd/pipeline/issues/9609

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-201NVD-CWE-noinfo

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