{"id":"CVE-2026-94422","title":"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","summary":"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 malic…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-290"],"vendor":"Fedora","product":"xdg-dbus-proxy","affected":["xdg-dbus-proxy < 0.1.9","xdg-dbus-proxy < 0.1.9","xdg-dbus-proxy (all versions)","xdg-dbus-proxy (all versions)"],"published":"2026-10-02","updated":"2026-10-02","sourceUpdated":"2026-10-02T14:17:12.003","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-94422","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-94422","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542235","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe96da3b39929a30a1ac3a22b16223e3","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4dba9600721921fbca2dbc39dc5ca400","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/xdg-dbus-proxy/commit/fc027f759316fb2a6c45648200b6f100202eb84e","label":"secalert@redhat.com"},{"url":"https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq","label":"secalert@redhat.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-02T14:20:32.574Z","slug":"CVE-2026-94422","body":"## Overview\n\nAn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}