CVE-2026-4390

TeamSpeak 3 Server Connection State Management process_resend_queue use after free

Assigner: VulDB
Reserved: 18.03.2026 Published: 27.05.2026 Updated: 27.05.2026

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.

Metrics

CVSS 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
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:X/RL:O/RC:C
CVSS Score: 5.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:X/RL:O/RC:C
CVSS Score: 5.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.0

CVSS Vector: AV:N/AC:L/Au:S/C:N/I:P/A:P/E:ND/RL:OF/RC:C
CVSS Score: 5.5

Access Vector	Network	Confidentiality Impact	None
Access Complexity	Low	Integrity Impact	Partial
Authentication	Single	Availability Impact	Partial

CVSS 2.0

Product Status

Vendor	n/a
Product	TeamSpeak 3 Server
Versions	Version 3.13.0 is affected Version 3.13.1 is affected Version 3.13.2 is affected Version 3.13.3 is affected Version 3.13.4 is affected Version 3.13.5 is affected Version 3.13.6 is affected Version 3.13.7 is affected Version 3.13.8 is unaffected

Vendor

n/a

Product

TeamSpeak 3 Server

Versions

Version 3.13.0 is affected
Version 3.13.1 is affected
Version 3.13.2 is affected
Version 3.13.3 is affected
Version 3.13.4 is affected
Version 3.13.5 is affected
Version 3.13.6 is affected
Version 3.13.7 is affected
Version 3.13.8 is unaffected

Credits

Michael Imfeld (modzero) finder

References

Problem Types