Description
A weakness has been identified in TeamSpeak 3 Server up to 3.13.7. This affects the function process_resend_queue of the component Connection State Management. This manipulation causes use after free. The attack may be initiated remotely. Upgrading to version 3.13.8 is able to mitigate this issue. The affected component should be upgraded.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | TeamSpeak 3 Server | 3.13.0, 3.13.1, 3.13.2, 3.13.3, 3.13.4, 3.13.5, 3.13.6, 3.13.7 | 3.13.8 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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born0monday/teamspeak3-vulnerabilities ★ 0 · May 9, 2026
Proof-of-concept exploits for CVE-2026-4390, CVE-2026-4391 and CVE-2026-4392 in TeamSpeak 3 server (3.13.7).
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- VDB-366314 | TeamSpeak 3 Server Connection State Management process_resend_queue use after free vdb-entry technical-description
- VDB-366314 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- https://modzero.com/en/advisories/mz-26-01-teamspeak/ related
- https://files.teamspeak-services.com/docs/security/TS-SA-2026-001.html related
- https://www.teamspeak.com/en/downloads/#server patch