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CVE-2026-40923

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

Medium5.4EPSS 0.22%
Published
Updated
Reserved
Assigned by
GitHub_M

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.

Timeline

  1. ID reserved

    By GitHub_M

  2. · 6 days later

    Published

  3. · 31 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-40923, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVDNVD · Modified3.1Medium5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS (exploitation in 30 days)
0.22% · top 87% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.

Weakness

Affected products

  • tektoncd · pipeline

    • affected >= 1.0.0, < 1.0.2
    • affected >= 1.2.0, < 1.3.4
    • affected >= 1.4.0, < 1.6.2
    • affected >= 1.7.0, < 1.9.3
    • affected >= 1.10.0, < 1.11.1

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-40923 badge
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Record last updated .