{"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"}}]}}

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