{"id":"CVE-2026-73212","state":"PUBLISHED","title":"coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/server/ns_turn_server.c uses ioa_addr_in_range() in src/client/ns_turn_ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 TCP CONNECT relay client to bypass an IPv4 denied-peer-ip range when the Coturn host has a useful translation route. This issue is fixed in version 4.13.1.","publishedAt":"2026-08-11T17:31:43.961Z","updatedAt":"2026-08-11T17:44:17.467Z","severity":{"score":5.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["coturn coturn"],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.13.1","status":"affected"}]}],"references":["https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4","https://github.com/coturn/coturn/pull/1945","https://github.com/coturn/coturn/pull/1947","https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda","https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc","https://github.com/coturn/coturn/releases/tag/4.13.1"],"weaknesses":["CWE-284","CWE-918"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73212.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73212","state":"PUBLISHED","datePublished":"2026-08-11T17:31:43.961Z","dateUpdated":"2026-08-11T17:44:17.467Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-11T14:41:20.121Z"},"containers":{"cna":{"title":"coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE","descriptions":[{"lang":"en","value":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/server/ns_turn_server.c uses ioa_addr_in_range() in src/client/ns_turn_ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 TCP CONNECT relay client to bypass an IPv4 denied-peer-ip range when the Coturn host has a useful translation route. This issue is fixed in version 4.13.1."}],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.13.1","status":"affected"}]}],"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4","name":"https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/coturn/coturn/pull/1945","name":"https://github.com/coturn/coturn/pull/1945","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/pull/1947","name":"https://github.com/coturn/coturn/pull/1947","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda","name":"https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc","name":"https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc","tags":["x_refsource_MISC"]},{"url":"https://github.com/coturn/coturn/releases/tag/4.13.1","name":"https://github.com/coturn/coturn/releases/tag/4.13.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":5.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","lang":"en","description":"CWE-284: Improper Access Control","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-11T17:31:43.961Z"},"source":{"advisory":"GHSA-2x4g-wx24-48m4","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-11T17:44:03.488057Z","id":"CVE-2026-73212","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":"2026-08-11T17:44:17.467Z"}}]}}}