Flatpak has a complete sandbox escape leading to host file access and code execution in the host context_CVE-2026-34078

{
    "lastseen": "",
    "description": "Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.",
    "published": "2026-04-07T21:27:45.643Z",
    "modified": "2026-04-11T00:21:12.650Z",
    "type": "cve",
    "title": "Flatpak has a complete sandbox escape leading to host file access and code execution in the host context",
    "source": "GitHub_M",
    "references": "https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg",
    "id": "CVE-2026-34078",
    "bulletinFamily": "",
    "cwe": [
        "CWE-61"
    ],
    "cvelist": null,
    "sourceData": "flatpak flatpak < 1.16.4",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "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": "flatpak",
    "version": "< 1.16.4",
    "vendor": "flatpak",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}