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CVE-2026-34080: xdg-dbus-proxy can let unauthorized apps read messages

CVE-2026-34080 · published 7 months ago

Summary

The xdg-dbus-proxy program that filters D-Bus communications on Debian, Flatpak, and Canonical systems can be tricked into allowing apps to see messages they shouldn't. This happens because the filter doesn't recognize a small formatting difference in its rules. Upgrade to version 0.1.7 or later to close the gap.

What to do

Update canonical xdg-dbus-proxy to version 0.1.3-1ubuntu0.1.
Update canonical xdg-dbus-proxy to version 0.1.5-1ubuntu0.2.
Update canonical xdg-dbus-proxy to version 0.1.6-1ubuntu0.1.
Update flatpak xdg-dbus-proxy to version 0.1.7 or later.

Affected software

Ecosystem	Vendor	Product	Affected versions
Debian:11	debian	xdg-dbus-proxy	All versions
Debian:12	debian	xdg-dbus-proxy	All versions
Debian:13	debian	xdg-dbus-proxy	All versions
Debian:14	debian	xdg-dbus-proxy	All versions
–	flatpak	xdg-dbus-proxy	< 0.1.7 `cpe:2.3:a:flatpak:xdg-dbus-proxy::::::::`
Ubuntu:Pro:20.04:LTS	canonical	xdg-dbus-proxy	All versions
Ubuntu:22.04:LTS	canonical	xdg-dbus-proxy	< 0.1.3-1ubuntu0.1 Fix: upgrade to 0.1.3-1ubuntu0.1
Ubuntu:24.04:LTS	canonical	xdg-dbus-proxy	< 0.1.5-1ubuntu0.2 Fix: upgrade to 0.1.5-1ubuntu0.2
Ubuntu:25.10	canonical	xdg-dbus-proxy	< 0.1.6-1ubuntu0.1 Fix: upgrade to 0.1.6-1ubuntu0.1

Original advisory text

xdg-dbus-proxy has an eavesdrop filter bypass allowing message interception

xdg-dbus-proxy is a filtering proxy for D-Bus connections. Prior to 0.1.7, a policy parser vulnerability allows bypassing eavesdrop restrictions. The proxy checks for eavesdrop=true in policy rules but fails to handle eavesdrop ='true' (with a space before the equals sign) and similar cases. Clients can intercept D-Bus messages they should not have access to. This vulnerability is fixed in 0.1.7.

References

https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-vjp5-hjfm-767... Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/10/15 URL
https://www.cve.org/CVERecord?id=CVE-2026-34080 Third Party Advisory
https://ubuntu.com/security/notices/USN-8167-1 Vendor Advisory
https://ubuntu.com/security/CVE-2026-34080 Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2026-34080 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2026/04/msg00022.html URL
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34080... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34080 Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

6.8 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-1289Improper Validation of Unsafe Equivalence in Input

Timeline

Published7 Apr 2026

Updated4 Nov 2026

First seen7 Apr 2026

Sources

CVE-2026-34080 · NVD

DEBIAN-CVE-2026-34080 · OSV

UBUNTU-CVE-2026-34080 · OSV

CVE-2026-34080 · OSV

GHSA-vjp5-hjfm-7677 · GHSA

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