# CVE-2026-94422: xdg-dbus-proxy message filtering bypass in D-Bus proxy

Source: https://junglewise.ai/threats/cve-2026-94422-an-incorrect-implementation-of-message-filtering-in-xdg-dbus  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-02. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-94422 · Severity: high · CVSS 8.8 · Published 2026-10-02

xdg-dbus-proxy is a filtering proxy that enforces sandbox boundaries for containerized applications like Flatpak. An attacker can bypass message filtering by manipulating reply serial numbers, allowing a compromised app to execute code outside its sandbox and potentially compromise the entire system.

Vendors: [Flatpak](https://junglewise.ai/threats/vendors/flatpak).

## Quick answers

**Is CVE-2026-94422 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-94422 being exploited in the wild.

**How severe is CVE-2026-94422?** High severity, with a CVSS score of 8.8, published 2 October 2026.

**Which products and versions are affected?** Flatpak Xdg-Dbus-Proxy before 0.1.9.

**Is there a fix for CVE-2026-94422?** Yes: fixed in 0.1.9. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-94422 attacked?** It is attacked over the network or from the adjacent network, in a software library.

**Am I affected by CVE-2026-94422?** Check whether you run Flatpak Xdg-Dbus-Proxy at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 0.1.9

## Technical details

An incorrect implementation of D-Bus message filtering in xdg-dbus-proxy before 0.1.9 allows bypass of intended access controls by setting a reply serial number on non-reply messages. The vulnerability affects the sandbox boundary enforcement mechanism; a malicious or compromised Flatpak application can exploit this via the D-Bus session bus to escape its sandbox isolation.

## Affected products

- Flatpak xdg-dbus-proxy before 0.1.9

## Timeline

- 2026-10-02: disclosed

## References

- [https://github.com/flatpak/xdg-dbus-proxy](https://github.com/flatpak/xdg-dbus-proxy)
- [https://bodhi.fedoraproject.org/updates/?packages=xdg-dbus-proxy](https://bodhi.fedoraproject.org/updates/?packages=xdg-dbus-proxy)

## Related threats

- [Flatpak xdg-dbus-proxy policy parser bypass in eavesdrop restrictions](https://junglewise.ai/threats/cve-2026-34080-flatpak-xdg-dbus-proxy-policy-parser-bypass-in-eavesdrop)