CVE-2026-34080
Received Received - Intake
Policy Parser Bypass in xdg-dbus-proxy Enables Message Eavesdropping

Publication date: 2026-04-07

Last updated on: 2026-04-21

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-04-07
Last Modified
2026-04-21
Generated
2026-06-16
AI Q&A
2026-04-08
EPSS Evaluated
2026-06-15
NVD
CVE-2026-34080
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
flatpak xdg-dbus-proxy to 0.1.7 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1289 The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.
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Executive Summary

The vulnerability exists in xdg-dbus-proxy, a filtering proxy for D-Bus connections. Before version 0.1.7, there was a flaw in the policy parser that allowed bypassing eavesdrop restrictions. Specifically, the proxy checks for the exact string 'eavesdrop=true' in policy rules but fails to correctly handle cases where there is a space before the equals sign, such as 'eavesdrop = 'true''. This flaw enables clients to intercept D-Bus messages they should not have access to.

This vulnerability was fixed in version 0.1.7 of xdg-dbus-proxy.

Impact Analysis

This vulnerability can allow unauthorized clients to intercept D-Bus messages that they are not supposed to access. This means sensitive inter-process communication data could be exposed to unauthorized parties, potentially leading to information disclosure or other security risks depending on the nature of the intercepted messages.

Mitigation Strategies

The vulnerability is fixed in xdg-dbus-proxy version 0.1.7. Immediate mitigation involves upgrading xdg-dbus-proxy to version 0.1.7 or later.

Compliance Impact

The vulnerability in xdg-dbus-proxy allows clients to bypass eavesdrop restrictions and intercept D-Bus messages they should not have access to.

This unauthorized interception of messages could potentially lead to exposure of sensitive information, which may impact compliance with data protection standards and regulations such as GDPR and HIPAA.

However, specific impacts on compliance are not detailed in the provided information.

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