CVE-2026-94422
Fixed in a distro release EPSS <1%CVSS 8.8
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.
Products: Fedora, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | xdg-dbus-proxy | 0.1.4-3+deb12u2 |
| Debian 13 | xdg-dbus-proxy | 0.1.6-1+deb13u3 |
| Debian 14 | xdg-dbus-proxy | 0.1.9-1 |
| Ubuntu 22.04 LTS | xdg-dbus-proxy | no fix |
| Ubuntu 24.04 LTS | xdg-dbus-proxy | no fix |
| Ubuntu 26.04 LTS | xdg-dbus-proxy | no fix |
| Ubuntu 26.10 | xdg-dbus-proxy | no fix |
| Ubuntu Pro 20.04 LTS | xdg-dbus-proxy | no fix |
| openSUSE Tumbleweed | xdg-dbus-proxy | 0.1.9-1.1 |