{"id":"CVE-2026-73214","state":"PUBLISHED","title":"coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS","description":"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 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.","publishedAt":"2026-08-11T17:34:51.860Z","updatedAt":"2026-08-12T22:13:33.373Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["coturn coturn"],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.16.0","status":"affected"}]}],"references":["https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4","https://github.com/coturn/coturn/pull/2003","https://github.com/coturn/coturn/pull/2012","https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85","https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09","https://github.com/coturn/coturn/releases/tag/4.16.0"],"weaknesses":["CWE-400","CWE-770"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73214.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73214","state":"PUBLISHED","datePublished":"2026-08-11T17:34:51.860Z","dateUpdated":"2026-08-12T22:13:33.373Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-11T14:41:20.121Z"},"containers":{"cna":{"title":"coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.16.0","status":"affected"}]}],"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4","name":"https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/coturn/coturn/pull/2003","name":"https://github.com/coturn/coturn/pull/2003","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/pull/2012","name":"https://github.com/coturn/coturn/pull/2012","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85","name":"https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09","name":"https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/releases/tag/4.16.0","name":"https://github.com/coturn/coturn/releases/tag/4.16.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-11T17:34:51.860Z"},"source":{"advisory":"GHSA-5x2p-4vqj-f6m4","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-12T22:07:47.118382Z","id":"CVE-2026-73214","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-12T22:13:33.373Z"}}]}}}