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Fencer Intel
medium 5.4

CVE-2026-40923 json

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

published 6mo ago modified 14d ago also EUVD-2026-24481 , GHSA-rx35-6rhx-7858 , GO-2026-5643

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/tektoncd/pipeline 1.0.2, 1.3.4, 1.6.2, 1.9.3, 1.11.1
  • linuxfoundation tekton_pipelines 1.0.2, 1.3.4, 1.6.2, 1.9.3, 1.11.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Is CVE-2026-40923 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-40923 updated cvss 5.4

github.com/tektoncd/pipeline: Tekton Pipelines: Unauthorized access and information disclosure via path validation bypass

  • Red Hat Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9, openshift-builds/openshift-builds-webhook-rhel9, openshift-builds/openshift-builds-rhel9-operator, openshift-builds/openshift-builds-controller-rhel9, openshift-builds/openshift-builds-git-cloner-rhel9, openshift-builds/openshift-builds-image-bundler-rhel9, +1 more Red Hat OpenShift Pipelines openshift-pipelines/pipelines-opc-rhel9, openshift-pipelines/pipelines-cli-tkn-rhel8, openshift-pipelines/pipelines-cli-tkn-rhel9, openshift-pipelines/pipelines-hub-api-rhel8, openshift-pipelines/pipelines-hub-api-rhel9, openshift-pipelines/pipelines-git-init-rhel8, +32 more Red Hat OpenShift Serverless openshift-serverless-1/kn-client-kn-rhel9, openshift-serverless-1/kn-plugin-func-func-util-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-ml-pipelines-driver-rhel8, rhoai/odh-ml-pipelines-launcher-rhel8, rhoai/odh-ml-pipelines-api-server-v2-rhel8, rhoai/odh-ml-pipelines-persistenceagent-v2-rhel8, rhoai/odh-ml-pipelines-scheduledworkflow-v2-rhel8 Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-ssp-operator-rhel9, container-native-virtualization/kubevirt-template-validator-rhel9, container-native-virtualization/kubevirt-tekton-tasks-create-datavolume-rhel9, container-native-virtualization/kubevirt-tekton-tasks-disk-virt-customize-rhel9 Red Hat Trusted Artifact Signer rhtas/ec-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/openshift-mcp-server-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-nop-rhel8, openshift-pipelines/pipelines-nop-rhel9, openshift-pipelines/pipelines-events-rhel8, openshift-pipelines/pipelines-events-rhel9, openshift-pipelines/pipelines-webhook-rhel8, openshift-pipelines/pipelines-webhook-rhel9, +10 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/tektoncd/pipeline
>=1.10.0, <1.11.1
>=1.7.0, <1.9.3
>=1.4.0, <1.6.2
>=1.2.0, <1.3.4
>=1.0.0, <1.0.2
>=1.1.0, <1.3.4
1.11.1
1.9.3
1.6.2
1.3.4
1.0.2

Affected products

  • tektoncd pipeline

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.