Kubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from virt-launcher_CVE-2026-13218

{
    "lastseen": "",
    "description": "A flaw was found in KubeVirt's virt-handler network cache handling. The WriteToCachedFile function writes data to a launcher-rooted path using os.WriteFile and os.Chown without symlink protection. A user with access to the virt-launcher container can plant a symlink at the cache file path, causing virt-handler to follow it and overwrite an arbitrary host file with JSON content and change its ownership.",
    "published": "2026-06-25T23:23:23.228Z",
    "modified": "2026-06-25T23:23:23.228Z",
    "type": "cve",
    "title": "Kubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from virt-launcher",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2026-13218\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2492654",
    "id": "CVE-2026-13218",
    "bulletinFamily": "",
    "cwe": [
        "CWE-61"
    ],
    "cvelist": null,
    "sourceData": "",
    "sourceHref": "",
    "cvss": {
        "score": 4.2,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L",
        "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": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Red Hat OpenShift Virtualization 4",
    "version": "",
    "vendor": "Red Hat",
    "ai_description": "",
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    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}