Coturn up to 4.14.x STUN Request Parsing ns_turn_server.c handle_turn_allocate data authenticity

Summaryinfo

A vulnerability was found in Coturn up to 4.14.x and classified as problematic. The affected element is the function handle_turn_allocate of the file src/server/ns_turn_server.c of the component STUN Request Parsing. The manipulation results in data authenticity. This vulnerability is reported as CVE-2026-68554. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Coturn up to 4.14.x. It has been classified as problematic. Affected is the function handle_turn_allocate of the file src/server/ns_turn_server.c of the component STUN Request Parsing. The manipulation with an unknown input leads to a data authenticity vulnerability. CWE is classifying the issue as CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. This is going to have an impact on integrity, and availability. CVE summarizes:

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an on-path attacker can append attributes after MESSAGE-INTEGRITY to an authenticated STUN request on plain UDP or TCP, adjust the STUN header length, and recompute the unkeyed FINGERPRINT while the original HMAC remains valid because it covers only the message prefix. Server-side parsing in src/server/ns_turn_server.c continues past MESSAGE-INTEGRITY through handle_turn_allocate(), handle_turn_create_permission(), handle_turn_refresh(), and handle_turn_command(), allowing trailing LIFETIME, XOR-PEER-ADDRESS, or ORIGIN attributes to override allocation lifetime, inject a permission, or bypass the origin check. TLS and DTLS deployments prevent this in-transit modification. This issue is fixed in version 4.15.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-68554 since 07/30/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 4.15.0 eliminates this vulnerability.

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Productinfo

Name

• Coturn

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14

Website

• Product: https://github.com/coturn/coturn/

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