{"id":"UBUNTU-CVE-2026-62959","details":"Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect \u003cURL\u003e and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.","modified":"2026-08-06T00:20:58Z","published":"2026-07-31T20:16:00Z","upstream":["CVE-2026-62959"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-62959"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-62959"},{"type":"REPORT","url":"https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g"},{"type":"REPORT","url":"https://github.com/coturn/coturn/pull/1965"},{"type":"REPORT","url":"https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4"},{"type":"REPORT","url":"https://github.com/coturn/coturn/releases/tag/4.15.0"}],"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_name":"coturn","binary_version":"4.5.0.3-1ubuntu0.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62959.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-2026-62959.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_name":"coturn","binary_version":"4.5.1.1-1.1ubuntu0.20.04.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62959.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_name":"coturn","binary_version":"4.5.2-3.1~ubuntu22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62959.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_version":"4.6.1-1build4","binary_name":"coturn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-62959.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-2026-62959.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}