{"schemaVersion":3,"id":"CVE-2026-40613","aliases":["MGASA-2026-0217","UBUNTU-CVE-2026-40613","DEBIAN-CVE-2026-40613"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-04-21T18:00:53.342Z","modified":"2026-04-21T20:36:46.136Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01525,"percentile":0.74433,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.4019999999999999,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.01123},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01525,"percentile":0.74433}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01123,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01525,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01525,"percentile":0.74433}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_COTURN_COTURN","name":"Coturn","source":"github","url":"https://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7p","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-704","name":"Incorrect Type Conversion or Cast","description":"The product does not correctly convert an object, resource, or structure from one type to a different type.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/704.html"}],"affected":[{"vendor":"coturn_project","product":"coturn","name":"coturn","label":"coturn","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.10.0","eol":null,"hubHref":"/vendor/coturn_project/coturn"},{"vendor":"coturn","product":"coturn","name":"coturn","label":"coturn","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.10.0","eol":null,"hubHref":"/vendor/coturn/coturn"},{"vendor":"debian","product":"coturn","name":"coturn","label":"coturn","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/coturn","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 4.12.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 4.12.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"coturn","name":"coturn","label":"coturn","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/coturn","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"mageia","product":"coturn","name":"coturn","label":"coturn","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/coturn","purlType":"rpm","versions":[{"text":"< 4.6.2-1.2.mga9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.6.2-1.2.mga9","eol":null,"hubHref":null}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36","label":"github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36","hostname":"github.com","tags":["X Refsource CONFIRM","Advisory","REPORT","Exploit","Vendor Advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0217.html","label":"advisories.mageia.org/MGASA-2026-0217.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35430","label":"bugs.mageia.org/show_bug.cgi?id=35430","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HRTRNKXK47ZP6AXDMKTC4HUO7YGKQM4Y/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["WEB"]},{"url":"https://ubuntu.com/security/CVE-2026-40613","label":"ubuntu.com/security/CVE-2026-40613","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40613","label":"www.cve.org/CVERecord?id=CVE-2026-40613","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-40613","label":"security-tracker.debian.org/tracker/CVE-2026-40613","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:11617-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11617-1"]},"timeline":[{"kind":"published","date":"2026-04-21T18:00:53.342Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-21T20:36:46.136Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":40,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T21:56:48.572Z","stale":false,"partial":false}}