CVE-2026-4392
TeamSpeak 3 Server Assertion Failure via Client Handshake
Publication date: 2026-05-27
Last updated on: 2026-05-27
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| teamspeak | teamspeak_3_server | to 3.13.7 (inc) |
| teamspeak | teamspeak_3_server | 3.13.8 |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
What immediate steps should I take to mitigate this vulnerability?
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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.