{"id":"CVE-2026-77642","aliases":["DEBIAN-CVE-2026-77642","EUVD-2026-63665","GHSA-36cc-rhpv-jrxc","MGASA-2026-0382","UBUNTU-CVE-2026-77642"],"status":"published","title":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached...","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00353,"percentile":0.2924,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2026-08-20T21:15:49Z","modified":"2026-10-28T02:30:24Z","fixes":[{"ecosystem":"Debian:12","package":"tor","fixed_in":["0.4.9.9-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"tor","fixed_in":["0.4.9.11-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"tor","fixed_in":["0.4.9.9-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.9-1"}]}],"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","0.4.9.5-1","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~bpo13+1"]},{"source":"osv","ecosystem":"Debian:13","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-0+deb13u1"}]}],"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","0.4.9.5-1","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":"0.4.9.9-1"}]}],"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","0.4.9.5-1","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~bpo13+1"]},{"source":"osv","ecosystem":"Mageia:10","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-1.mga10"}]}],"bundled":7},{"source":"osv","ecosystem":"Mageia:9","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-1.mga9"}]}],"bundled":7},{"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:26.04: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"]}],"products":[{"vendor":"torproject","product":"tor"}],"references":[{"url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLog","tags":["Permissions Required","Release Notes","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77642","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-36cc-rhpv-jrxc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77642.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77642","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0382.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=36213","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/J3OOWWFCIOAR7SCIVWYWCHHV6G2BGSPN/","tags":["web"]},{"url":"https://lists.debian.org/debian-security-announce/2026/msg00283.html","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-77642","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77642","tags":["report"]},{"url":"https://gitlab.torproject.org/tpo/core/tor/-/work_items/41267","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-77642","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-20T21:15:49.66Z","modified":"2026-08-27T16:07:03.716Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:20:16.072351Z"}],"euvd":[{"id":"EUVD-2026-63665","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-20T21:15:49Z","modified":"2026-08-27T16:07:03Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T18:01:27.663452Z"}],"ghsa":[{"id":"GHSA-36cc-rhpv-jrxc","title":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached...","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-21T00:31:23Z","modified":"2026-08-21T00:31:31Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:10:48.883791Z"}],"nvd":[{"id":"CVE-2026-77642","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-20T22:18:06.07Z","modified":"2026-10-18T20:10:00.11Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:12:40.302911Z"}],"osv":[{"id":"CVE-2026-77642","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-20T21:15:49.66Z","modified":"2026-10-28T02:30:24.183824849Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:45:17.44708Z"},{"id":"DEBIAN-CVE-2026-77642","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory   authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-20T22:18:06.07Z","modified":"2026-10-23T17:47:35.774314345Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"critical"}],"updated_at":"2026-11-02T15:46:03.502256Z"},{"id":"UBUNTU-CVE-2026-77642","description":"tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or  detached signature with unexpected signature digest type. Impact  is minor for most Tor roles, but potentially major for directory authorities. This is TROVE-2026-019.","status":"published","published":"2026-08-20T22:18:00Z","modified":"2026-09-10T11:00:38.932387353Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"high"},{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H","level":"critical"}],"updated_at":"2026-11-02T16:57:18.015985Z"},{"id":"MGASA-2026-0382","title":"Updated tor packages fix security vulnerabilities","description":"An out-of-bounds write when parsing a consensus or detached signature\nwith unexpected signature digest type (CVE-2026-77642).\nA NULL write after free when sending a CONFLUX_SWITCH cell fails,\nresulting in a crash (CVE-2026-77641).\nAn infinite loop when decompressing a truncated zlib/gzip stream with\ndone=1 (CVE-2026-77640).\nA compression bomb bypass where an attacker could concatenate many gzip\nor zlib sub-streams (CVE-2026-77639).\nA race condition where in just the right circumstances a rendezvous\npoint could man-in-the-middle (impersonate) the onion service that the\nclient was trying to reach (CVE-2026-77638).\nA use-after-free that a malicious exit node could use to crash a client\n(CVE-2026-77587).\nTor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a\ncircuit which already has attached streams (CVE-2026-77584).\n","status":"published","published":"2026-09-08T02:47:35Z","modified":"2026-09-08T03:00:03.416717026Z","updated_at":"2026-11-02T15:49:43.795591Z"}]}}