Authentication Bypass Affecting xdg-dbus-proxy package, versions <0.1.6-1+deb13u3


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.69% (52nd percentile)

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  • Snyk IDSNYK-ECHOLATEST-XDGDBUSPROXY-20079411
  • published24 Sept 2026
  • disclosed2 Oct 2026

Introduced: 24 Sep 2026

NewCVE-2026-94422  (opens in a new tab)
CWE-290  (opens in a new tab)

How to fix?

Upgrade Echo:latest xdg-dbus-proxy to version 0.1.6-1+deb13u3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xdg-dbus-proxy package and not the xdg-dbus-proxy package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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 Base Scores

version 3.1