{"id":"CVE-2026-77587","aliases":["DEBIAN-CVE-2026-77587","EUVD-2026-63593","GHSA-9mf5-x83c-fg2x","MGASA-2026-0382","UBUNTU-CVE-2026-77587","openSUSE-SU-2026:11590-1","openSUSE-SU-2026:21660-1"],"status":"published","title":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object...","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00405,"percentile":0.35037,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416","CWE-911"],"published":"2026-08-20T20:47:39Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"Debian:12","package":"tor","fixed_in":["0.4.9.11-0+deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"tor","fixed_in":["0.4.9.11-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"tor","fixed_in":["0.4.9.11-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-0+deb12u1"}]}],"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","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":"0.4.9.11-1"}]}],"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","0.4.9.11-1~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":"0.4.9.11-1.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"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-1.1"}]}],"bundled":3},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"tor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.9.11-bp160.1.1"}]}],"bundled":3}],"products":[{"vendor":"torproject","product":"tor"}],"references":[{"url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog","tags":["Permissions Required","Release Notes","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77587","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9mf5-x83c-fg2x"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77587.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77587","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-2026-77587","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77587","tags":["report"]},{"url":"https://gitlab.torproject.org/tpo/core/tor/-/work_items/41306","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-77584","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-77587","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-77638","tags":["web"]},{"url":"https://bugzilla.suse.com/1275918","tags":["report"]},{"url":"https://bugzilla.suse.com/1275919","tags":["report"]},{"url":"https://bugzilla.suse.com/1275920","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-77587","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T20:47:39.964Z","modified":"2026-08-25T19:09:06.542Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-911"],"updated_at":"2026-11-02T14:20:15.712761Z"}],"euvd":[{"id":"EUVD-2026-63593","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T20:47:39Z","modified":"2026-08-25T19:09:06Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T18:01:32.174502Z"}],"ghsa":[{"id":"GHSA-9mf5-x83c-fg2x","title":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object...","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T21:31:30Z","modified":"2026-09-16T15:30:37Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-416","CWE-911"],"updated_at":"2026-11-02T15:11:58.93371Z"}],"nvd":[{"id":"CVE-2026-77587","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T21:17:10.957Z","modified":"2026-10-18T20:10:00.11Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-911","CWE-416"],"updated_at":"2026-11-02T14:12:40.302911Z"}],"osv":[{"id":"CVE-2026-77587","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T20:47:39.964Z","modified":"2026-10-28T02:30:57.199335454Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-911"],"updated_at":"2026-11-02T15:45:17.44708Z"},{"id":"DEBIAN-CVE-2026-77587","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T21:17:10.957Z","modified":"2026-10-23T17:47:21.467796515Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:03.502256Z"},{"id":"UBUNTU-CVE-2026-77587","description":"Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.","status":"published","published":"2026-08-20T21:17:00Z","modified":"2026-09-18T12:30:36.760815759Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"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"},{"id":"openSUSE-SU-2026:11590-1","title":"tor-0.4.9.11-1.1 on GA media","description":"These are all security issues fixed in the tor-0.4.9.11-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-24T00:00:00Z","modified":"2026-08-26T18:23:38.292773678Z","updated_at":"2026-11-02T16:58:39.516824Z"},{"id":"openSUSE-SU-2026:21660-1","title":"Security update for tor","description":"This update for tor fixes the following issues:\n\nChanges in tor:\n\n- Update to 0.4.9.11\n  * Major bugfixes\n    + onion services: Prevent a race condition (boo#1275918, CVE-2026-77638)\n    + client: no longer assert and exit if an onion service encodes an\n      all-zero public key for one of its introduction points\n    + directory authorities: Stop allowing 0 as a port in exit policy lines\n    + security, conflux: Fix a use-after-free (and potential double free)\n      (boo#1275919, CVE-2026-77587, TROVE-2026-026)\n\n- Update to 0.4.9.10\n  * Major bugfixes\n    + conflux, security: Reject a CONFLUX_LINK cell that arrives on a circuit\n      which already has attached streams. (boo#1275920, CVE-2026-77584, TROVE-2026-025)\n    + client: Resume warning about unsafe socks protocols when SafeSocks\n      is not set. Also resume warning every time when TestSocks is set.\n    + Make clients more consistently expire entry guards 48 to 60 days\n      after they are first used.\n","status":"published","published":"2026-08-25T20:46:16Z","modified":"2026-08-27T18:23:13.783181288Z","updated_at":"2026-11-02T16:58:41.885092Z"}]}}