CVE-2026-90616

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{"bugzilla": {"description": "flatpak: Flatpak: Arbitrary code execution via missing symlink protection", "id": "2532613", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532613"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-59", "details": ["In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.", "A flaw was found in Flatpak. A malicious sandboxed application can exploit missing symlink protection during the creation and bind-mounting of app data directories. By manipulating attacker-controlled path components, a malicious symlink can redirect these directories to arbitrary locations on the host system. This allows the sandboxed application to gain arbitrary read and write access to host files, which can be escalated to arbitrary code execution on the host."], "mitigation": {"lang": "en:us", "value": "To reduce the risk of exploitation, users should only install Flatpak applications from trusted sources. Regularly reviewing and removing unnecessary or untrusted Flatpak applications can further limit exposure."}, "name": "CVE-2026-90616", "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": "2026-09-12T20:00:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-90616\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-90616\nhttps://github.com/flatpak/flatpak/security/advisories/GHSA-8688-9x26-hhxj\nhttps://www.openwall.com/lists/oss-security/2026/08/11/9"], "threat_severity": "Important"}

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