CVE-2026-4391 TeamSpeak 3 Server ECC Key heap-based overflow
Remote attackers can trigger a heap-based buffer overflow in the ECC Key Parser, potentially leading to code execution or service disruption.
- 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-2026-4391?
CVE-2026-4391 is a medium-severity memory corruption 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 security vulnerability has been detected in TeamSpeak 3 Server up to 3.13.7. This vulnerability affects unknown code of the component ECC Key Parser. Such manipulation leads to heap-based buffer overflow. The attack may be launched remotely. Upgrading to version 3.13.8 is able to resolve this issue. It is suggested to upgrade the affected component.
Which versions are affected by CVE-2026-4391?
How do I fix CVE-2026-4391?
No fix has been published for CVE-2026-4391 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-4391 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4391 exists.
Sources
Also known as GHSA-h574-9fvh-93j7.