CVE-2026-4390 TeamSpeak 3 Server Connection State Management process_resend_queue use after free
Remote attackers can exploit a use-after-free flaw in TeamSpeak 3 Server's connection state management to potentially execute code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4390?
CVE-2026-4390 is a medium-severity use after free vulnerability in TeamSpeak 3 Server, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-4390?
How do I fix CVE-2026-4390?
No fix has been published for CVE-2026-4390 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-4390 being exploited?
There is no known exploitation of CVE-2026-4390 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-cr8m-87qj-3732.