CVE-2026-94422
An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an…
- Risk score
- 68/100
- CVSS
- 8.8 v3.1
- Exploit chance (30 days)
- 0.7%
- Published
- 2 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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…
- Affected
- See advisory
- Fix
- Upgrade the product to 0.1.9 or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.8 high
- Remotely exploitable without logging in
References
- https://access.redhat.com/security/cve/CVE-2026-94422
- https://bugzilla.redhat.com/show_bug.cgi?id=2542235
- https://github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe96da3b39929a30a1ac3a22b16223e3
- https://github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4dba9600721921fbca2dbc39dc5ca400
- https://github.com/flatpak/xdg-dbus-proxy/commit/fc027f759316fb2a6c45648200b6f100202eb84e
- https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq
- http://www.openwall.com/lists/oss-security/2026/09/23/5
- https://lists.debian.org/debian-lts-announce/2026/10/msg00050.html
Original 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.
Last activity 2 Oct 2026. Patch Forecast updates every hour.