{"id":"CVE-2026-94422","summary":"xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape","details":"An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an attacker to bypass the intended message filtering on the D-Bus session bus by setting a reply serial number on non-reply messages. A malicious or compromised Flatpak app could use this to achieve arbitrary code execution outside its sandbox. xdg-dbus-proxy was designed to be part of the sandbox boundary for Flatpak, but it is released as a separate project and is sometimes used by other app frameworks such as Firejail.","aliases":["GHSA-2cgv-pwcq-wvpq"],"modified":"2026-10-03T03:47:01.614168338Z","published":"2026-10-02T13:54:10.589Z","related":["openSUSE-SU-2026:11913-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/94xxx/CVE-2026-94422.json","cna_assigner":"redhat","cwe_ids":["CWE-290"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/09/23/5"},{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-94422"},{"type":"WEB","url":"https://bodhi.fedoraproject.org/updates/?packages=xdg-dbus-proxy"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542235"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/94xxx/CVE-2026-94422.json"},{"type":"PACKAGE","url":"https://github.com/flatpak/xdg-dbus-proxy"},{"type":"FIX","url":"https://github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe96da3b39929a30a1ac3a22b16223e3"},{"type":"FIX","url":"https://github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4dba9600721921fbca2dbc39dc5ca400"},{"type":"FIX","url":"https://github.com/flatpak/xdg-dbus-proxy/commit/fc027f759316fb2a6c45648200b6f100202eb84e"},{"type":"ADVISORY","url":"https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94422"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flatpak/xdg-dbus-proxy","events":[{"introduced":"0"},{"fixed":"72b40c8f6d9d585cfbdb249690724f740d207087"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.1.9"}],"source":"AFFECTED_FIELD"}}],"versions":["0.1.8","0.1.7","0.1.6","0.1.5","0.1.4","0.1.3","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-94422.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}