{"id":"UBUNTU-CVE-2026-87724","details":"Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032.","modified":"2026-09-16T14:02:39.669382962Z","published":"2026-09-09T02:16:00Z","upstream":["CVE-2026-87724"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-87724"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-87724"},{"type":"REPORT","url":"https://gitlab.torproject.org/tpo/core/tor/-/work_items/41345"},{"type":"REPORT","url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/release-0.4.9/ChangeLog?ref_type=heads"}],"affected":[{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.3.25-1","0.2.4.19-1","0.2.4.20-1","0.2.4.27-1build0.14.04.1","0.2.4.27-1ubuntu0.1","0.2.4.27-1ubuntu0.1+esm1","0.2.4.27-1ubuntu0.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.2.4.27-1ubuntu0.1+esm2"},{"binary_version":"0.2.4.27-1ubuntu0.1+esm2","binary_name":"tor-geoipdb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.6.10-1ubuntu2","0.2.7.6-1ubuntu1","0.2.9.11-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.2","0.2.9.14-1ubuntu1~16.04.3","0.2.9.14-1ubuntu1~16.04.3+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1","binary_name":"tor"},{"binary_name":"tor-geoipdb","binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.3.0.10-1","0.3.1.8-2","0.3.1.9-1","0.3.2.9-1","0.3.2.9-1build1","0.3.2.10-1","0.3.2.10-1ubuntu0.1","0.3.2.10-1ubuntu0.2~esm1","0.3.2.10-1ubuntu0.2~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.3.2.10-1ubuntu0.2~esm2","binary_name":"tor"},{"binary_name":"tor-geoipdb","binary_version":"0.3.2.10-1ubuntu0.2~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.1.5-1","0.4.1.5-1build1","0.4.1.6-1","0.4.2.5-1","0.4.2.6-1","0.4.2.7-1","0.4.2.7-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.2.7-1ubuntu0.1~esm1","binary_name":"tor"},{"binary_name":"tor-geoipdb","binary_version":"0.4.2.7-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.5.9-1","0.4.6.8-1","0.4.6.8-1build1","0.4.6.9-1","0.4.6.10-1","0.4.9.11-0ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.4.9.11-0ubuntu0.22.04.1"},{"binary_name":"tor-geoipdb","binary_version":"0.4.9.11-0ubuntu0.22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8.4-2","0.4.8.7-1","0.4.8.9-1","0.4.8.10-1","0.4.8.10-1build1","0.4.8.10-1build2","0.4.9.11-0ubuntu0.24.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.4.9.11-0ubuntu0.24.04.1"},{"binary_version":"0.4.9.11-0ubuntu0.24.04.1","binary_name":"tor-geoipdb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8.16-1","0.4.8.21-1","0.4.8.22-1","0.4.9.6-1","0.4.9.11-0ubuntu0.26.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.4.9.11-0ubuntu0.26.04.1"},{"binary_name":"tor-geoipdb","binary_version":"0.4.9.11-0ubuntu0.26.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87724.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H"},{"type":"Ubuntu","score":"medium"}]}