CVE-2026-94422 xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape
Attackers can bypass D-Bus message filtering in xdg-dbus-proxy to escape Flatpak sandboxes and execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-94422?
CVE-2026-94422 is a high-severity vulnerability in Fedora, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-290
Which versions are affected by CVE-2026-94422?
Linux distribution packages (4)
xdg-dbus-proxy AlmaLinux:10 | All versions | 0.1.5-4.el10_2.1 |
xdg-dbus-proxy AlmaLinux:9 | All versions | 0.1.3-1.el9_8.1 |
xdg-dbus-proxy Rocky Linux:10 | All versions | 0:0.1.5-4.el10_2.1 |
xdg-dbus-proxy Rocky Linux:9 | All versions | 0:0.1.3-1.el9_8.1 |
How do I fix CVE-2026-94422?
Upgrade to a fixed version.
Is CVE-2026-94422 being exploited?
There is no known exploitation of CVE-2026-94422 in the wild and no public exploit code.
Sources
Also known as ALSA-2026:90522, ALSA-2026:90523, AZL-105923, DEBIAN-CVE-2026-94422, ECHO-ab97-ca4d-bc8e, GHSA-2cgv-pwcq-wvpq and 8 more.