CVE-2026-4392
Deferred Deferred - Pending Action
TeamSpeak 3 Server Assertion Failure via Client Handshake

Publication date: 2026-05-27

Last updated on: 2026-05-27

Assigner: VulDB

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.
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Meta Information
Published
2026-05-27
Last Modified
2026-05-27
Generated
2026-06-17
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4392
EUVD
EUVD-2026-32592
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
teamspeak teamspeak_3_server to 3.13.7 (inc)
teamspeak teamspeak_3_server 3.13.8
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-617 The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
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Executive Summary

CVE-2026-4392 is a vulnerability in TeamSpeak 3 Server versions up to 3.13.7 and TeamSpeak SDK versions 3.3.1 and below. It involves an assertion failure triggered by manipulating an argument called proof in the clientek Handshake Handler component. This crafted input can cause the server to reach an assertion, potentially leading to denial-of-service conditions such as service instability or server restarts.

The vulnerability can be exploited remotely without authentication, making it possible for attackers to disrupt the service.

The issue has been fixed in TeamSpeak 3 Server version 3.13.8 and TeamSpeak SDK version 3.5.0, and upgrading is recommended to mitigate the risk.

Impact Analysis

This vulnerability can be exploited remotely by unauthenticated attackers to cause denial-of-service conditions on the TeamSpeak 3 Server or SDK. This means the server could become unstable, restart unexpectedly, or become unavailable to legitimate users.

Such disruptions can affect communication services relying on TeamSpeak, potentially impacting business operations, gaming communities, or any environment using this software for voice communication.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to upgrade TeamSpeak 3 Server to version 3.13.8 or later.

Upgrading the affected component is recommended to address the assertion failure vulnerability that could allow unauthenticated remote attackers to cause denial-of-service conditions.

Compliance Impact

The provided information does not specify any direct impact of CVE-2026-4392 on compliance with common standards and regulations such as GDPR or HIPAA.

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