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

published 2026-04-07 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-19945

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 4

flatpak xdg-dbus-proxy 0.1.7

debian ubuntu suse opensuse

xdg-dbus-proxy Debian 12 0.1.4-3+deb12u1
xdg-dbus-proxy Debian 13 0.1.6-1+deb13u1
xdg-dbus-proxy Debian 14 0.1.7-1

debian advisories DEBIAN-CVE-2026-34080

xdg-dbus-proxy Ubuntu 22.04 LTS 0.1.3-1ubuntu0.1
xdg-dbus-proxy Ubuntu 24.04 LTS 0.1.5-1ubuntu0.2
xdg-dbus-proxy Ubuntu 25.10 0.1.6-1ubuntu0.1
xdg-dbus-proxy Ubuntu Pro 20.04 LTS 0.1.2-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-34080

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

xdg-dbus-proxy SLE Module for Basesystem 15 SP7 0.1.5-150600.3.5.1
xdg-dbus-proxy SLES for SAP applications 16.0, SLES 16.0 0.1.6-160000.3.1

suse advisories SUSE-SU-2026:2755-1 SUSE-SU-2026:22096-1

xdg-dbus-proxy openSUSE Leap 16.0 0.1.6-160000.3.1
xdg-dbus-proxy openSUSE Tumbleweed 0.1.7-1.1

opensuse advisories openSUSE-SU-2026:20934-1 openSUSE-SU-2026:10625-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-34080 updated 2026-11-07 cvss 5.5

xdg-dbus-proxy: xdg-dbus-proxy: Information disclosure due to policy parser vulnerability

Red Hat Enterprise Linux 9 xdg-dbus-proxy Red Hat Enterprise Linux 10 xdg-dbus-proxy
affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-04-08)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	4.0	6.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

flatpak xdg-dbus-proxy

Classification

Weakness

CWE-1289 Improper Validation of Unsafe Equivalence in Input

References

github.com /flatpak/xdg-dbus-proxy/security/advisories/GHSA-vjp5-hjfm-7677
vendor-advisory
openwall.com /lists/oss-security/2026/04/10/15
third-party-advisory
lists.debian.org /debian-lts-announce/2026/04/msg00022.html

Sources

CVE List CVE-2026-34080
NVD CVE-2026-34080

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary