TI-2026-28815 Aliases CVE-2026-39959 GHSA-xrw6-gwf8-vvr9

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

LOW 30CWE-290Published 2026-04-09 · Updated 2026-04-09

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass, Denial of service
Confidentiality · integrity · availability: None · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290 and CWE-770.

Summary

Tmds.DBus provides .NET libraries for working with D-Bus from .NET. 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. This vulnerability is fixed in Tmds.DBus 0.92.0 and Tmds.DBus.Protocol 0.92.0 and 0.21.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00126 2nd percentileScored 2026-11-07

Fix Fixed Tmds.DBus (tmds): 0.92.0Tmds.DBus.Protocol (tmds): 0.21.3, 0.92.0+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
tmds	Tmds.DBus	before 0.92.0	0.92.0	Patch available	CNA
tmds	Tmds.DBus.Protocol	before 0.21.3; 0.22.0 to before 0.92.0	0.21.3, 0.92.0	Patch available	CNA
—	Tmds.DBus (NuGet)	before 0.92.0	0.92.0	Patch available	GHSA-xrw6-gwf8-vvr9
—	Tmds.DBus.Protocol (NuGet)	before 0.21.3	0.21.3	Patch available	GHSA-xrw6-gwf8-vvr9
—	Tmds.DBus.Protocol (NuGet)	0.22.0 to before 0.92.0	0.92.0	Patch available	GHSA-xrw6-gwf8-vvr9

Tmds.DBus Vendortmds Affected before 0.92.0 Fixed in 0.92.0 Patch available CNA
Tmds.DBus.Protocol Vendortmds Affected before 0.21.3; 0.22.0 to before 0.92.0 Fixed in 0.21.3, 0.92.0 Patch available CNA
Tmds.DBus (NuGet) Vendor— Affected before 0.92.0 Fixed in 0.92.0 Patch available GHSA-xrw6-gwf8-vvr9
Tmds.DBus.Protocol (NuGet) Vendor— Affected before 0.21.3 Fixed in 0.21.3 Patch available GHSA-xrw6-gwf8-vvr9
Tmds.DBus.Protocol (NuGet) Vendor— Affected 0.22.0 to before 0.92.0 Fixed in 0.92.0 Patch available GHSA-xrw6-gwf8-vvr9

Remediation

Fix · CNA Tmds.DBus (tmds) Fixed in 0.92.0
Fix · CNA Tmds.DBus.Protocol (tmds) Fixed in 0.21.3, 0.92.0
Fix · GHSA-xrw6-gwf8-vvr9 Tmds.DBus (NuGet) Fixed in 0.92.0 Advisory →
Fix · GHSA-xrw6-gwf8-vvr9 Tmds.DBus.Protocol (NuGet) Fixed in 0.21.3 Advisory →
Fix · GHSA-xrw6-gwf8-vvr9 Tmds.DBus.Protocol (NuGet) Fixed in 0.92.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-39959
2026-10-03 Alias added: GHSA-xrw6-gwf8-vvr9

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-39959

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences