Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check_CVE-2026-40923

{
    "lastseen": "",
    "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.",
    "published": "2026-04-21T20:50:53.742Z",
    "modified": "2026-04-21T20:50:53.742Z",
    "type": "cve",
    "title": "Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check",
    "source": "GitHub_M",
    "references": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858\nhttps://github.com/tektoncd/pipeline/releases/tag/v1.11.1",
    "id": "CVE-2026-40923",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "tektoncd pipeline < 1.11.1",
    "sourceHref": "",
    "cvss": {
        "score": 5.4,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "pipeline",
    "version": "< 1.11.1",
    "vendor": "tektoncd",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}