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CVE-2026-4391

TeamSpeak 3 Server ECC Key heap-based overflow

A security vulnerability has been detected in TeamSpeak 3 Server up to 3.13.8. 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 3.13.9 is able to resolve this issue. It is suggested to upgrade the affected component. The vendor explains: "We have just released TeamSpeak 3 Server 3.13.9 to address a remaining variant of CVE-2026-4391, affecting ECC key parsing during the connection handshake. The original fix released with 3.13.8 did not cover this additional variant, which could allow an unauthenticated remote attacker to crash the server using specially crafted input."

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Teamspeak 3 Server
Products
Teamspeak 3 Server
CVE-2026-4392

TeamSpeak 3 Server clientek Handshake assertion

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.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Teamspeak 3 Server
Products
Teamspeak 3 Server
CVE-2026-4390

TeamSpeak 3 Server Connection State Management process_resend_queue use after free

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.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Teamspeak 3 Server
Products
Teamspeak 3 Server