CVE-2026-73213

A flaw was found in Coturn. An authenticated TURN client can bypass configured IP address restrictions due to an incorrect component-wise IPv6 comparison in the addrlesseq function. This allows the client to relay traffic to an IPv6 peer that should be denied, leading to a Server-Side Request...

CVE-2026-73213: Incorrect Authorization

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addrlesseq in src/client/nsturnioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioaaddrinrange, allowing an authenticated TURN client to relay to an IPv6 peer that is numerically...