CVE-2026-4391

TeamSpeak 3 Server ECC Key heap-based overflow

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

A security vulnerability has been detected in TeamSpeak 3 Server up to 3.13.7. This vulnerability affects unknown code of the component ECC Key Parser. Such manipulation leads to heap-based buffer overflow. The attack may be launched remotely. Upgrading to version 3.13.8 is able to resolve this issue. It is suggested to upgrade the affected component.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
CVSS Score: 6.9

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

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
CVSS Score: 5.3

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

CVSS 3.1

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
CVSS Score: 5.3

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

CVSS 3.0

CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C
CVSS Score: 5

Access Vector	Network	Confidentiality Impact	None
Access Complexity	Low	Integrity Impact	None
Authentication	None	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