CVE-2026-94422

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

24 Oct 2026, 04:18

Type	Values Removed	Values Added
References		() https://lists.debian.org/debian-lts-announce/2026/10/msg00050.html -

02 Oct 2026, 15:17

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/09/23/5 -

02 Oct 2026, 14:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-02 14:17

Updated : 2026-10-24 04:18

NVD link : CVE-2026-94422

Mitre link : CVE-2026-94422

CVE.ORG link : CVE-2026-94422

JSON object : View

Products Affected

No product.

CWE

CWE-290

Authentication Bypass by Spoofing

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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."}], "lastModified": "2026-10-24T04:18:27.610", "sourceIdentifier": "secalert@redhat.com"}