CVE-2026-73212: Coturn

Medium severity, CVSS 5.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Coturn Coturn: before 4.13.1 (fixed in 4.13.1)

Published 2026-08-11. Last modified 2026-09-09.