{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34078", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-25T16:21:40.868Z", "datePublished": "2026-04-07T21:27:45.643Z", "dateUpdated": "2026-04-09T10:25:47.224Z"}, "containers": {"cna": {"title": "Flatpak has a complete sandbox escape leading to host file access and code execution in the host context", "problemTypes": [{"descriptions": [{"cweId": "CWE-61", "lang": "en", "description": "CWE-61: UNIX Symbolic Link (Symlink) Following", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "vectorString": "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"}}], "references": [{"name": "https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg"}], "affected": [{"vendor": "flatpak", "product": "flatpak", "versions": [{"version": "< 1.16.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-07T21:27:45.643Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-cc2q-qc34-jprg", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-08T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-34078"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-09T03:56:08.431Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/04/09/8"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-04-09T10:25:47.224Z"}}]}}

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{"bugzilla": {"description": "flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options", "id": "2456276", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456276"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-59", "details": ["A flaw was found in Flatpak, a Linux application sandboxing and distribution framework. A malicious application could exploit this by using specially crafted symlinks within the sandbox-expose options of the Flatpak portal. This allows the application to access arbitrary host files and potentially achieve code execution on the host system, bypassing the intended security sandbox."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-34078", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "flatpak", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-07T21:27:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34078\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34078\nhttps://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg"], "threat_severity": "Moderate"}