CVE-2026-73216: Coturn

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

Affected products

• Coturn Coturn: before 4.17.0 (fixed in 4.17.0)

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