Description
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."
References7
Metrics
- CVSS 3.1
-
5.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 4.0
-
6.9
MEDIUM
Score source: CNA
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 — exploit probability
- 1% percentile: 52 · as of 14 November 2026
- CWE
- CWE-119CWE-122
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.