Is CVE-2026-4391 actively exploited?

No active exploitation of CVE-2026-4391 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4391 be exploited remotely?

Yes. CVE-2026-4391 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4391?

CVE-2026-4391 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-4391

CWE-119Published: May 27, 2026· Updated: May 27, 2026

5.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.1th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-4391 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.