PT-2026-44052 · Teamspeak · Teamspeak 3 Server

Michael Imfeld · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-4392

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions TeamSpeak 3 Server versions prior to 3.13.8

Description An issue exists in the clientek Handshake Handler component due to improper processing. A remote attacker can trigger a reachable assertion by manipulating the proof argument.

Recommendations Update to version 3.13.8.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-4392

Affected Products

Teamspeak 3 Server

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-4392 · Security Note
• https://teamspeak.com/en/downloads/#server · Patch
• https://twitter.com/CVEnew/status/2059718140737781867 · Twitter Post
• https://modzero.com/en/advisories/mz-26-01-teamspeak · Note
• https://vuldb.com/vuln/366316/cti · Note
• https://twitter.com/infoflowcloud/status/2059719098741739561 · Twitter Post
• https://vuldb.com/vuln/366316 · Note
• https://files.teamspeak-services.com/docs/security/TS-SA-2026-001.html · Note