{"id":"CVE-2026-40613","state":"PUBLISHED","title":"Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64)","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.","publishedAt":"2026-04-21T18:00:53.342Z","updatedAt":"2026-04-21T20:36:46.136Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["coturn coturn"],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.10.0","status":"affected"}]}],"references":["https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36"],"weaknesses":["CWE-704"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40613.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40613","state":"PUBLISHED","datePublished":"2026-04-21T18:00:53.342Z","dateUpdated":"2026-04-21T20:36:46.136Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-14T14:07:59.642Z"},"containers":{"cna":{"title":"Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64)","descriptions":[{"lang":"en","value":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0."}],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.10.0","status":"affected"}]}],"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36","name":"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-704","lang":"en","description":"CWE-704: Incorrect Type Conversion or Cast","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-21T18:00:53.342Z"},"source":{"advisory":"GHSA-j662-9wcj-mf36","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-21T19:54:32.854613Z","id":"CVE-2026-40613","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-21T20:36:46.136Z"}}]}}}