CVE-2026-40923

Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check

MEDIUM

5.4

CVSS Score

Published: April 21, 2026 at 08:50 PM UTC

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

2 products affected across 2 vendorsTekton PipelinesPipeline

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Severity

MEDIUM5.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Prior to 1.11.1, a validation bypass in the VolumeMount path restriction allows mounting volumes under restricted /tekton/ internal paths by using .. path traversal components. The restriction check uses strings.HasPrefix without filepath.Clean, so a path like /tekton/home/../results passes validation but resolves to /tekton/results at runtime. This vulnerability is fixed in 1.11.1.

Affected

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

Tekton Pipelines · Linuxfoundationgo

95%

v < 1.11.1

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-rx35-6rhx-7858

References (2)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858

x_refsource_MISCRelease Notes

Source: cverecord

https://github.com/tektoncd/pipeline/releases/tag/v1.11.1

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.4MEDIUMGitHub_M

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-22

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