Authentication Bypass Affecting xdg-dbus-proxy-debugsource package, versions <0:0.1.9-1.amzn2023.0.1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.69% (52nd percentile)

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  • Snyk IDSNYK-AMZN2023-XDGDBUSPROXYDEBUGSOURCE-20851716
  • published13 Oct 2026
  • disclosed2 Oct 2026

Introduced: 2 Oct 2026

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

How to fix?

Upgrade Amazon-Linux:2023 xdg-dbus-proxy-debugsource to version 0:0.1.9-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-3185.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xdg-dbus-proxy-debugsource package and not the xdg-dbus-proxy-debugsource package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 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