Buffer overflow in Teamspeak 3 Server
CVE-2026-4391
A security vulnerability has been detected in TeamSpeak 3 Server up to 3.13.7. 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 3.13.8 is able to resolve this issue. It is suggested to upgrade the affected component.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Teamspeak 3 Server — versions 3.13.0, 3.13.1, 3.13.2
Weakness classification (CWE)
References
- vuldb.com/vuln/366315 (vdb-entry)
- vuldb.com/vuln/366315/cti (signature, permissions-required)
- modzero.com/en/advisories/mz-26-01-teamspeak/ (related)
- files.teamspeak-services.com/docs/security/TS-SA-2026-001.html (related)
- www.teamspeak.com/en/downloads/ (patch)
Frequently asked questions
- What is CVE-2026-4391?
- CVE-2026-4391 is a medium-severity vulnerability in Teamspeak 3 Server, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-05-27.
- How severe is CVE-2026-4391?
- Medium severity. CVSS v3 base score is 5.3 out of 10.