{"schemaVersion":3,"id":"CVE-2026-73215","aliases":["UBUNTU-CVE-2026-73215","DEBIAN-CVE-2026-73215"],"status":"published","duplicateOf":null,"title":"The coturn server can end in a state where it does not accept more requests with \"even-port\" enabled.","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, turnports_allocate_even() in src/apps/relay/turn_ports.c marks the unused odd sibling port as TPS_TAKEN_ODD for an EVEN-PORT Allocate request with reservation bit R=0 even though no RTCP socket will release it, allowing an authenticated client to permanently exhaust the relay port pool and cause subsequent allocations to fail with STUN error 508. 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