CVE-2026-73213: Coturn

Medium severity, CVSS 5.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addr_less_eq() in src/client/ns_turn_ioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioa_addr_in_range(), allowing an authenticated TURN client to relay to an IPv6 peer that is numerically within a configured non-prefix-aligned denied-peer-ip range but is classified as outside it. This issue is fixed in version 4.16.0.

Affected products

• Coturn Coturn: before 4.16.0 (fixed in 4.16.0)

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