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CVE-2026-4391

MediumPublished

TeamSpeak 3 Server ECC Key heap-based overflow

Published: May 27, 2026
Updated: May 27, 2026
Assigning CNA: VulDB
Evidence observed: Aug 8, 2026

Primary CVSS

6.9/ 10Medium

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 35.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

teamspeak3-vulnerabilitiesPoC
Proof-of-concept exploits for CVE-2026-4390, CVE-2026-4391 and CVE-2026-4392 in TeamSpeak 3 server (3.13.7).

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