CVE-2026-94422CWE-290

CVE-2026-94422

High · published October 2, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
52.4
In the wild
Unconfirmed
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 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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00693 · 52.4th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-10-02T18:17Z
References (7)
https://access.redhat.com/security/cve/CVE-2026-94422 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2542235 · [email protected]https://github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe96da3b39929a30a1ac3a22b16223e3 · [email protected]https://github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4dba9600721921fbca2dbc39dc5ca400 · [email protected]https://github.com/flatpak/xdg-dbus-proxy/commit/fc027f759316fb2a6c45648200b6f100202eb84e · [email protected]https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq · [email protected]http://www.openwall.com/lists/oss-security/2026/09/23/5 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 04 OCT 03:32Z
    EPSS moved — → 1%
    epss
  • 02 OCT 13:54Z
    xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape
    cvelistv5