High 8.8Published Oct 2, 2026

CVE-2026-94422xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape

Updated under an hour ago (Oct 26, 2026, 8:40 PM ET)

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It affects Fedora and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.69%, higher than 52% of scored CVEs.

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-290
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.69% (percentile 52)
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Fedora Fedora fedora:fedora (from the name)	before 0.1.9	CNA record
Red Hat Red Hat Enterprise Linux 9 redhat:enterprise_linux	9	CNA record

References

References

https://access.redhat.com/security/cve/CVE-2026-94422	vendor-advisory
https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq	third-party-advisory
https://github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4dba9600721921fbca2dbc39dc5ca400	patch
https://github.com/flatpak/xdg-dbus-proxy/commit/fc027f759316fb2a6c45648200b6f100202eb84e	patch
https://github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe96da3b39929a30a1ac3a22b16223e3	patch
https://bugzilla.redhat.com/show_bug.cgi?id=2542235	issue-tracking
http://www.openwall.com/lists/oss-security/2026/09/23/5
https://lists.debian.org/debian-lts-announce/2026/10/msg00050.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.