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CVE-2026-4392

MediumPublished

TeamSpeak 3 Server clientek Handshake assertion

Published: May 27, 2026
Updated: May 28, 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: 34.1%
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 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.

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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