CVE-2026-73212

A flaw was found in Coturn. An authenticated client using the RFC 6062 TCP CONNECT relay path can bypass intended IPv4 denied-peer-ip range restrictions due to improper canonicalization of IPv4-compatible, 6to4, and NAT64 address forms. This vulnerability can lead to Server-Side Request Forgery...

CVE-2026-73212 coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, goodpeeraddr in src/server/nsturnserver.c uses ioaaddrinrange in src/client/nsturnioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 T...