CVE-2026-4392: TeamSpeak 3 Server clientek Handshake assertion

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-27 · updated 2026-06-17
Weakness: CWE-617

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.

Affected products

TeamSpeak 3 Server: 3.13.0, 3.13.1, 3.13.2, 3.13.3, 3.13.4, 3.13.5 (+2)

References

https://files.teamspeak-services.com/docs/security/TS-SA-2026-001.html
https://modzero.com/en/advisories/mz-26-01-teamspeak/
https://vuldb.com/vuln/366316
https://vuldb.com/vuln/366316/cti
https://www.teamspeak.com/en/downloads/#server

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