Is CVE-2026-4390 actively exploited?

No active exploitation of CVE-2026-4390 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4390 be exploited remotely?

Yes. CVE-2026-4390 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4390?

CVE-2026-4390 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-4390

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

5.4

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-4390 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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