{"schemaVersion":3,"id":"CVE-2026-68552","aliases":["UBUNTU-CVE-2026-68552","DEBIAN-CVE-2026-68552"],"status":"published","duplicateOf":null,"title":null,"description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16_t len variable in stun_get_message_len_str() in src/client/ns_turn_msg.c to wrap when STUN_HEADER_LENGTH is added. The framing layer then consumes only 4 through 16 bytes, treats the remaining bytes as another message, desynchronizes the stream parser, and drops the attacking client's connection. Other clients and the server process are not affected. This issue is fixed in version 4.15.0.","dates":{"published":"2026-08-19T20:39:14.822Z","modified":"2026-08-21T21:48:07.059Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","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:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","exploitability":10,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"vendor":"coturn","product":"coturn","name":"coturn","label":"coturn","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.15.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0","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":"< 4.15.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 4.15.0-1","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}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-m562-mf7x-q7rr","label":"github.com/coturn/coturn/security/advisories/GHSA-m562-mf7x-q7rr","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT"]},{"url":"https://github.com/coturn/coturn/pull/1964","label":"github.com/coturn/coturn/pull/1964","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/coturn/coturn/commit/ed32e1fb6c843f9cf9a28d91c541dfbf40874f25","label":"github.com/coturn/coturn/commit/ed32e1fb6c843f9cf9a28d91c541dfbf40874f25","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/coturn/coturn/releases/tag/4.15.0","label":"github.com/coturn/coturn/releases/tag/4.15.0","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-68552","label":"ubuntu.com/security/CVE-2026-68552","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68552","label":"www.cve.org/CVERecord?id=CVE-2026-68552","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-68552","label":"security-tracker.debian.org/tracker/CVE-2026-68552","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":"2026-08-19T20:39:14.822Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-21T21:48:07.059Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T16:30:13.792Z","stale":false,"partial":false}}