Coturn up to 4.13.0 Address Validation ns_turn_server.c good_peer_addr access control

Summaryinfo

A vulnerability was found in Coturn up to 4.13.0 and classified as critical. The affected element is the function good_peer_addr of the file src/server/ns_turn_server.c of the component Address Validation. The manipulation results in access control. This vulnerability is known as CVE-2026-73212. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Coturn up to 4.13.0. Affected is the function good_peer_addr of the file src/server/ns_turn_server.c of the component Address Validation. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/server/ns_turn_server.c uses ioa_addr_in_range() in src/client/ns_turn_ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 TCP CONNECT relay client to bypass an IPv4 denied-peer-ip range when the Coturn host has a useful translation route. This issue is fixed in version 4.13.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-73212 since 08/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 4.13.1 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
• 4.13.0

Website

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

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