{"id":"CVE-2026-73213","state":"PUBLISHED","title":"Coturn: `addr_less_eq()` does a component-wise IPv6 comparison instead of a lexicographic one, letting an authenticated TURN client bypass `denied-peer-ip`/`allowed-peer-ip` IPv6 ranges (TURN-specific SSRF)","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addr_less_eq() in src/client/ns_turn_ioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioa_addr_in_range(), allowing an authenticated TURN client to relay to an IPv6 peer that is numerically within a configured non-prefix-aligned denied-peer-ip range but is classified as outside it. This issue is fixed in version 4.16.0.","publishedAt":"2026-08-11T17:33:12.757Z","updatedAt":"2026-08-13T14:52:10.582Z","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":"< 4.16.0","status":"affected"}]}],"references":["https://github.com/coturn/coturn/security/advisories/GHSA-4v97-rxjj-4f99","https://github.com/coturn/coturn/commit/6c13608c28a04af5d63abddd7565a0dcc4771c28","https://github.com/coturn/coturn/releases/tag/4.16.0"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73213.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73213","state":"PUBLISHED","datePublished":"2026-08-11T17:33:12.757Z","dateUpdated":"2026-08-13T14:52:10.582Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-11T14:41:20.121Z"},"containers":{"cna":{"title":"Coturn: `addr_less_eq()` does a component-wise IPv6 comparison instead of a lexicographic one, letting an authenticated TURN client bypass `denied-peer-ip`/`allowed-peer-ip` IPv6 ranges (TURN-specific SSRF)","descriptions":[{"lang":"en","value":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addr_less_eq() in src/client/ns_turn_ioaddr.c uses a component-wise comparison for native IPv6 min-max intervals in ioa_addr_in_range(), allowing an authenticated TURN client to relay to an IPv6 peer that is numerically within a configured non-prefix-aligned denied-peer-ip range but is classified as outside it. 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-4v97-rxjj-4f99","name":"https://github.com/coturn/coturn/security/advisories/GHSA-4v97-rxjj-4f99","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/coturn/coturn/commit/6c13608c28a04af5d63abddd7565a0dcc4771c28","name":"https://github.com/coturn/coturn/commit/6c13608c28a04af5d63abddd7565a0dcc4771c28","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":"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-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-11T17:33:12.757Z"},"source":{"advisory":"GHSA-4v97-rxjj-4f99","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-4v97-rxjj-4f99","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-13T14:52:04.854291Z","id":"CVE-2026-73213","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-13T14:52:10.582Z"}}]}}}