{"id":"CVE-2026-87724","aliases":["DEBIAN-CVE-2026-87724","EUVD-2026-74539","GHSA-c2x3-p37c-phvc","MGASA-2026-0392","UBUNTU-CVE-2026-87724","openSUSE-SU-2026:11909-1"],"status":"published","title":"Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which...","description":"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.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00429,"percentile":0.3736,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-669"],"published":"2026-09-09T01:29:46Z","modified":"2026-10-28T11:19:22Z","fixes":[{"ecosystem":"Debian:13","package":"tor","fixed_in":["0.4.9.12-0+deb13u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"tor","fixed_in":["0.4.9.12-2"],"sources":["osv"]},{"ecosystem":"Mageia:10","package":"tor","fixed_in":["0.4.9.12-1.mga10"],"sources":["osv"]},{"ecosystem":"Mageia:9","package":"tor","fixed_in":["0.4.9.12-1.mga9"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"tor","fixed_in":["0.4.9.13-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.7.13-1","0.4.7.16-1","0.4.8.10-1","0.4.8.10-1~bpo11+1","0.4.8.10-1~bpo12+1","0.4.8.11-1","0.4.8.11-1~bpo11+1","0.4.8.11-1~bpo12+1","0.4.8.12-1","0.4.8.12-1.1","0.4.8.12-1~bpo11+1","0.4.8.12-1~bpo12+1","0.4.8.13-1","0.4.8.13-2","0.4.8.13-2~bpo12+1","0.4.8.14-1","0.4.8.14-1~bpo12+1","0.4.8.16-1","0.4.8.21-1","0.4.8.21-1~bpo12+1","0.4.8.21-1~bpo13+1","0.4.8.21-1~bpo13+2","0.4.8.22-1","0.4.8.22-1~bpo12+1","0.4.8.22-1~bpo13+1","0.4.8.4-2","0.4.8.5-1","0.4.8.6-1","0.4.8.7-1","0.4.8.8-1","0.4.8.9-1","0.4.8.9-1~bpo11+1","0.4.8.9-1~bpo12+1","0.4.9.11-0+deb12u1","0.4.9.11-1","0.4.9.11-1~bpo13+1","0.4.9.12-2","0.4.9.12-3","0.4.9.12-4","0.4.9.13-1","0.4.9.5-1","0.4.9.5-2","0.4.9.5-2~bpo12+1","0.4.9.5-2~bpo13+1","0.4.9.6-0+deb12u1","0.4.9.6-1","0.4.9.6-1~bpo12+1","0.4.9.6-1~bpo13+1","0.4.9.8-0+deb12u1","0.4.9.8-1","0.4.9.8-1~bpo12+1","0.4.9.8-1~bpo13+1","0.4.9.9-1","0.4.9.9-1~bpo13+1"]},{"source":"osv","ecosystem":"Debian:13","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.12-0+deb13u2"}]}],"versions":["0.4.8.16-1","0.4.8.21-1","0.4.8.21-1~bpo12+1","0.4.8.21-1~bpo13+1","0.4.8.21-1~bpo13+2","0.4.8.22-1","0.4.8.22-1~bpo12+1","0.4.8.22-1~bpo13+1","0.4.9.11-0+deb13u1","0.4.9.11-1","0.4.9.11-1~bpo13+1","0.4.9.12-0+deb13u1","0.4.9.5-1","0.4.9.5-2","0.4.9.5-2~bpo12+1","0.4.9.5-2~bpo13+1","0.4.9.6-0+deb13u1","0.4.9.6-1","0.4.9.6-1~bpo12+1","0.4.9.6-1~bpo13+1","0.4.9.8-0+deb13u1","0.4.9.8-1","0.4.9.8-1~bpo12+1","0.4.9.8-1~bpo13+1","0.4.9.9-1","0.4.9.9-1~bpo13+1"]},{"source":"osv","ecosystem":"Debian:14","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.12-2"}]}],"versions":["0.4.8.16-1","0.4.8.21-1","0.4.8.21-1~bpo12+1","0.4.8.21-1~bpo13+1","0.4.8.21-1~bpo13+2","0.4.8.22-1","0.4.8.22-1~bpo12+1","0.4.8.22-1~bpo13+1","0.4.9.11-1","0.4.9.11-1~bpo13+1","0.4.9.5-1","0.4.9.5-2","0.4.9.5-2~bpo12+1","0.4.9.5-2~bpo13+1","0.4.9.6-1","0.4.9.6-1~bpo12+1","0.4.9.6-1~bpo13+1","0.4.9.8-1","0.4.9.8-1~bpo12+1","0.4.9.8-1~bpo13+1","0.4.9.9-1","0.4.9.9-1~bpo13+1"]},{"source":"osv","ecosystem":"Mageia:10","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.12-1.mga10"}]}]},{"source":"osv","ecosystem":"Mageia:9","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.12-1.mga9"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.9.6-1","0.4.9.8-1","0.4.9.11-1","0.4.9.11-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"tor","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"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.13-1.1"}]}]}],"products":[{"vendor":"torprject","product":"tor"},{"vendor":"torproject","product":"tor"}],"references":[{"url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.12/ChangeLog","tags":["web"]},{"url":"https://gitlab.com/torproject/tor/-/commit/10d4b8ffefa7c00aab2b631ed7e7f15e42cd012d","tags":["fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87724","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c2x3-p37c-phvc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87724.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-87724","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0392.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=36284","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/09/08/20","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-87724","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-87724","tags":["report"]},{"url":"https://gitlab.torproject.org/tpo/core/tor/-/work_items/41345","tags":["report"]},{"url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/release-0.4.9/ChangeLog?ref_type=heads","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-87724","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-87724","description":"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.","status":"published","published":"2026-09-09T01:29:46.295Z","modified":"2026-09-09T18:18:39.27Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-669"],"updated_at":"2026-11-02T13:37:47.463822Z"}],"euvd":[{"id":"EUVD-2026-74539","description":"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.","status":"published","published":"2026-09-09T01:29:46Z","modified":"2026-09-09T18:18:39Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium"}],"updated_at":"2026-11-02T17:28:25.986684Z"}],"ghsa":[{"id":"GHSA-c2x3-p37c-phvc","title":"Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which...","description":"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.","status":"published","published":"2026-09-09T03:30:46Z","modified":"2026-09-09T03:30:52Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium"}],"cwes":["CWE-669"],"updated_at":"2026-11-02T15:11:37.523128Z"}],"nvd":[{"id":"CVE-2026-87724","description":"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.","status":"published","published":"2026-09-09T02:16:57.67Z","modified":"2026-09-09T19:17:50.287Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-669"],"updated_at":"2026-11-02T14:12:45.612639Z"}],"osv":[{"id":"CVE-2026-87724","description":"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.","status":"published","published":"2026-09-09T01:29:46.295Z","modified":"2026-10-28T11:19:22.777935561Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium"}],"cwes":["CWE-669"],"updated_at":"2026-11-02T15:45:19.210277Z"},{"id":"DEBIAN-CVE-2026-87724","description":"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.","status":"published","published":"2026-09-09T02:16:57.67Z","modified":"2026-10-01T03:03:52.159597993Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium"}],"updated_at":"2026-11-02T15:46:05.506112Z"},{"id":"UBUNTU-CVE-2026-87724","description":"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.","status":"published","published":"2026-09-09T02:16:00Z","modified":"2026-10-17T13:01:14.869942488Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"medium"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"MGASA-2026-0392","title":"Updated tor packages fix security vulnerabilities","description":"Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when\nCC_REQUEST was not sent, which allows remote attackers to cause a denial\nof service (crash) because of corrupted congestion-control\nstate(CVE-2026-87724)\nDo not purge memory for OOM from within low-level code (TROVE-2026-043).\nA hostile cache could trick a client into falsely believing that certain\nrelays' microdescriptors or router descriptors were unusable\n(TROVE-2026-034).\nFix a use-after-free error (TROVE-2026-036).\nLimit the size of consensus diffs, in bytes and in lines, to prevent a\nclass of memory-based denial-of-service attacks (TROVE-2026-042).\nNegotiate CGO cryptography with every hop that supports it\n(TROVE-2026-033).\nValidate DNS names for complience whenever providing or receiving them\nfrom evdns, to limit exposure to a class of application and library bugs\n(TROVE-2026-035).\n","status":"published","published":"2026-09-11T22:47:08Z","modified":"2026-09-11T23:00:03.563205532Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:11909-1","title":"tor-0.4.9.13-1.1 on GA media","description":"These are all security issues fixed in the tor-0.4.9.13-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-28T00:00:00Z","modified":"2026-09-29T18:23:14.901321798Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}