Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching_CVE-2026-25542

{
    "lastseen": "",
    "description": "Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 0.43.0 to 1.11.0, trusted resources verification policies match a resource source string (refSource.URI) against spec.resources[].pattern using regexp.MatchString. In Go, regexp.MatchString reports a match if the pattern matches anywhere in the string, so common unanchored patterns (including examples in tekton documentation) can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This can cause an unintended policy match and change which verification mode/keys apply.",
    "published": "2026-04-21T16:05:43.217Z",
    "modified": "2026-04-21T16:05:43.217Z",
    "type": "cve",
    "title": "Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching",
    "source": "GitHub_M",
    "references": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr\nhttps://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a",
    "id": "CVE-2026-25542",
    "bulletinFamily": "",
    "cwe": [
        "CWE-185"
    ],
    "cvelist": null,
    "sourceData": "tektoncd pipeline >= 0.43.0, <= 1.11.0",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "pipeline",
    "version": ">= 0.43.0, <= 1.11.0",
    "vendor": "tektoncd",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}