Bug 2537014 (CVE-2026-93676)

Summary: CVE-2026-93676 xdg-dbus-proxy: xdg-dbus-proxy: filtering for broadcast messages bypasses path/interface/member checks
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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xdg-dbus-proxy incorrectly filters D-Bus broadcast messages, bypassing configured path, interface, and member restrictions. This allows a sandboxed Flatpak application to intercept broadcast signals on the D-Bus session bus and AT-SPI bus that should be restricted, potentially exposing sensitive information to unauthorized applications.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-18 14:09:58 UTC 
A flaw was found in xdg-dbus-proxy. The filtering logic applied to D-Bus broadcast messages does not correctly enforce the configured path, interface, and member restrictions. As a result, a malicious or compromised Flatpak application can intercept broadcast signals on the D-Bus session bus and the AT-SPI bus that should have been filtered out, potentially exposing information from other applications on the bus to an unauthorized sandboxed application.

Upstream advisory: https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-r7hp-698j-2h6c
Affected versions: 0.1.6, 0.1.7
Fixed version: 0.1.8
Upstream CVSS: 3.2 (Low)