CVE-2026-4392
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
CVE-2026-4392 is a reachable assertion in TeamSpeak 3 Server through crafted input, allowing unauthenticated remote denial-of-service.
Vulnerability
A reachable assertion vulnerability exists in the clientek Handshake Handler component of TeamSpeak 3 Server up to version 3.13.7 [1]. By manipulating the proof argument during a handshake, an attacker can trigger an assertion failure, causing the affected process to abort. The issue is classified as CWE-617 (Reachable Assertion).
Exploitation
An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted network request containing a malformed proof argument to the TeamSpeak 3 Server [1]. No prior authentication or user interaction is required; the attack is conducted over the network using the server's listening port.
Impact
Successful exploitation results in a denial-of-service (DoS) condition [1]. The server process terminates due to the assertion failure, leading to service instability or a server restart. The vulnerability has a CVSS v3 base score of 7.5 (High) with an impact on availability only (C:N/I:N/A:H) [1].
Mitigation
TeamSpeak released version 3.13.8 on May 27, 2026, which addresses this vulnerability [1]. Users should upgrade all affected TeamSpeak 3 Server installations to version 3.13.8 or later. No workarounds are mentioned in the advisory. TeamSpeak SDK server-side integrations (version 3.3.1 and below) are also affected and should be updated to version 3.5.0 [1].
AI Insight generated on May 27, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
2- Range: <=3.13.7
- Range: <=3.13.7
Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
5News mentions
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