{"id":"CVE-2026-73214","title":"Coturn is a free open source implementation of TURN and STUN Server","summary":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state fo…","severity":"none","cwe":["CWE-400","CWE-770"],"published":"2026-08-11","updated":"2026-09-09","sourceUpdated":"2026-09-09T20:55:04.493","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73214","references":[{"url":"https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/pull/2003","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/pull/2012","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/releases/tag/4.16.0","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00577,"epssPercentile":0.45127,"ingestedAt":"2026-09-09T21:22:45.529Z","slug":"CVE-2026-73214","body":"## Overview\n\nCoturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}