Bug 2542235 (CVE-2026-94422)

Summary:	CVE-2026-94422 xdg-dbus-proxy: xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	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.	Story Points:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-27 22:28:14 UTC

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.

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.

Impact: A malicious or compromised Flatpak app could achieve arbitrary code execution outside its sandbox. If other app frameworks rely on xdg-dbus-proxy in the same way that Flatpak does, then they will have an equivalent vulnerability until xdg-dbus-proxy is updated.

Fixed in 0.1.9 by commits:
* e5702fca4dba9600721921fbca2dbc39dc5ca400 "proxy: Don't assume that only returns and errors have a reply-serial"
* fc027f759316fb2a6c45648200b6f100202eb84e "proxy: Make it clearer which direction messages are going in"
* e4465a0dfe96da3b39929a30a1ac3a22b16223e3 "proxy: Only allow replies to go to the correct destination"

Reported by @refi64.

Reference: https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq