Medium severity · published Apr 21, 2026
CVE-2026-40923
Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
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, 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. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
pipeline · tektoncd
>= 1.0.0, < 1.0.2; >= 1.2.0, < 1.3.4; >= 1.4.0, < 1.6.2; >= 1.7.0, < 1.9.3; >= 1.10.0, < 1.11.1 · source: vendor
TP
Tekton Pipelines · Linuxfoundation
before 1.11.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40923
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40923
Release Notes
https://github.com/tektoncd/pipeline/releases/tag/v1.11.1
Vendor Advisory
https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858
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