{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40613","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-14T14:07:59.642Z","datePublished":"2026-04-21T18:00:53.342Z","dateUpdated":"2026-04-21T20:36:46.136Z"},"containers":{"cna":{"title":"Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64)","problemTypes":[{"descriptions":[{"cweId":"CWE-704","lang":"en","description":"CWE-704: Incorrect Type Conversion or Cast","type":"CWE"}]}],"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"}}],"references":[{"name":"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36","tags":["x_refsource_CONFIRM"],"url":"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36"}],"affected":[{"vendor":"coturn","product":"coturn","versions":[{"version":"< 4.10.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-21T18:00:53.342Z"},"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."}],"source":{"advisory":"GHSA-j662-9wcj-mf36","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-21T20:36:46.136Z"}}]}}