CVE-2026-4392 TeamSpeak 3 Server clientek Handshake assertion
Remote attackers can trigger a reachable assertion in the clientek Handshake Handler, causing a denial of service in TeamSpeak 3 Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4392?
CVE-2026-4392 is a medium-severity denial of service vulnerability in TeamSpeak 3 Server, published on 27 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was detected in TeamSpeak 3 Server up to 3.13.7. This issue affects some unknown processing of the component clientek Handshake Handler. Performing a manipulation of the argument proof results in reachable assertion. Remote exploitation of the attack is possible. Upgrading to version 3.13.8 is capable of addressing this issue. Upgrading the affected component is recommended.
Weakness: CWE-617
Which versions are affected by CVE-2026-4392?
How do I fix CVE-2026-4392?
No fix has been published for CVE-2026-4392 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-4392 being exploited?
There is no known exploitation of CVE-2026-4392 in the wild and no public exploit code.
Sources
Also known as GHSA-jfq9-pq7p-655w.