CVE-2026-4390: TeamSpeak 3 Server Connection State Management process_resend_queue use after free

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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-119

Description

A weakness has been identified in TeamSpeak 3 Server up to 3.13.7. This affects the function process_resend_queue of the component Connection State Management. This manipulation causes use after free. The attack may be initiated remotely. Upgrading to version 3.13.8 is able to mitigate this issue. The affected component should be upgraded.

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/366314
https://vuldb.com/vuln/366314/cti
https://www.teamspeak.com/en/downloads/#server

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