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CVE-2026-39959 — Vulnerability in Tmds.DBus.Protocol — CVE Details

HIGH

Tmds.DBus: malicious D-Bus peers can spoof signals, exhaust file descriptor resources, and cause denial of service

Published April 8, 2026Updated April 9, 2026Source: osv

Summary

Tmds.DBus and Tmds.DBus.Protocol are vulnerable to malicious D-Bus peers. A peer on the same bus can spoof signals by impersonating the owner of a well-known name, exhaust system resources or cause file descriptor spillover by sending messages with an excessive number of Unix file descriptors, and crash the application by sending malformed message bodies that cause unhandled exceptions on the SynchronizationContext. ### Patches The vulnerabilities are fixed in version 0.92.0. For Tmds.DBus.Protocol, the fixes are also backported to 0.21.3. ### Workarounds There are no known workarounds. Users should upgrade to a patched version.

Advisory Timeline

  • First published April 8, 2026 (187 days ago).
  • Last revised April 9, 2026 — 1 day after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Tmds.DBus.Protocol to 0.21.3 or later
dotnet add package Tmds.DBus.Protocol --version 0.21.3
NuGet
Update Tmds.DBus to 0.92.0 or later
dotnet add package Tmds.DBus --version 0.92.0
NuGet
Update Tmds.DBus.Protocol to 0.92.0 or later
dotnet add package Tmds.DBus.Protocol --version 0.92.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: nuget (2).

PackageEcosystemAffectedFixed In
Tmds.DBus.Protocol
nuget
0.12.0, 0.13.0, 0.14.0, 0.15.0 (+8 more)0.21.3
Tmds.DBus
nuget
0.1.0, 0.10.1, 0.11.0, 0.12.0 (+28 more)0.92.0
Tmds.DBus.Protocol
nuget
0.22.0, 0.23.0, 0.90.0, 0.90.1 (+4 more)0.92.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.1 score means for each attack dimension.

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-39959?
Tmds.DBus: malicious D-Bus peers can spoof signals, exhaust file descriptor resources, and cause denial of service This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.1/10).
How do I check if my project is affected by CVE-2026-39959?
CVE-2026-39959 affects Tmds.DBus.Protocol and Tmds.DBus. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-39959 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.1

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-xrw6-gwf8-vvr9

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