CVE-2026-39959 json
Tmds.DBus: malicious D-Bus peers can spoof signals, exhaust file descriptor resources, and cause denial of service
published 2026-04-08 7 mo ago modified 2026-10-26 13 d ago also GHSA-xrw6-gwf8-vvr9 , EUVD-2026-20964
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 2%
- public exploits
- 0
- none known
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.
Patch / fix
- nuget Tmds.DBus 0.92.0
- nuget Tmds.DBus.Protocol 0.21.3, 0.92.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| GitHub | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Tmds.DBus | <0.92.0 |
0.92.0 |
| nuget | Tmds.DBus.Protocol | <0.21.3 >=0.22.0, <0.92.0 |
0.21.3 0.92.0 |
Affected products
- tmds Tmds.DBus
- tmds Tmds.DBus.Protocol
Classification
References
Sources
- CVE List CVE-2026-39959
- GitHub Advisory GHSA-xrw6-gwf8-vvr9
- NVD CVE-2026-39959
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