{"id":"UBUNTU-CVE-2026-73215","details":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, turnports_allocate_even() in src/apps/relay/turn_ports.c marks the unused odd sibling port as TPS_TAKEN_ODD for an EVEN-PORT Allocate request with reservation bit R=0 even though no RTCP socket will release it, allowing an authenticated client to permanently exhaust the relay port pool and cause subsequent allocations to fail with STUN error 508. This issue is fixed in version 4.17.0.","modified":"2026-08-19T11:11:14Z","published":"2026-08-11T18:18:00Z","upstream":["CVE-2026-73215"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-73215"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-73215"},{"type":"REPORT","url":"https://github.com/coturn/coturn/security/advisories/GHSA-847g-qmc6-6m4r"},{"type":"REPORT","url":"https://github.com/coturn/coturn/commit/4adbd82e78456e13109bf44deed4ec3aceb0bab2"},{"type":"REPORT","url":"https://github.com/coturn/coturn/releases/tag/4.17.0"}],"affected":[{"package":{"name":"coturn","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/coturn?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.5.4-2","4.5.0.2-3","4.5.0.3-1","4.5.0.3-1build1","4.5.0.3-1ubuntu0.2","4.5.0.3-1ubuntu0.3","4.5.0.3-1ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.0.3-1ubuntu0.4","binary_name":"coturn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73215.json"}},{"package":{"name":"coturn","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/coturn?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.0.6-1ubuntu2","4.5.0.7-1ubuntu1","4.5.0.7-1ubuntu2","4.5.0.7-1ubuntu2.18.04.1","4.5.0.7-1ubuntu2.18.04.2","4.5.0.7-1ubuntu2.18.04.3"],"ecosystem_specific":{"binaries":[{"binary_name":"coturn","binary_version":"4.5.0.7-1ubuntu2.18.04.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73215.json"}},{"package":{"name":"coturn","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/coturn?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.1.1-1.1build1","4.5.1.1-1.1build2","4.5.1.1-1.1ubuntu0.20.04.1","4.5.1.1-1.1ubuntu0.20.04.2"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.1.1-1.1ubuntu0.20.04.2","binary_name":"coturn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73215.json"}},{"package":{"name":"coturn","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/coturn?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.2-3","4.5.2-3.1~ubuntu22.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.5.2-3.1~ubuntu22.04.1","binary_name":"coturn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73215.json"}},{"package":{"name":"coturn","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/coturn?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1build1","4.6.1-1build2","4.6.1-1build3","4.6.1-1build4"],"ecosystem_specific":{"binaries":[{"binary_name":"coturn","binary_version":"4.6.1-1build4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73215.json"}},{"package":{"name":"coturn","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/coturn?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-2build1","4.6.1-2build2"],"ecosystem_specific":{"binaries":[{"binary_name":"coturn","binary_version":"4.6.1-2build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73215.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}