{"id":"DEBIAN-CVE-2026-77641","details":"tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was   ignored, so a send failure (which calls circuit_mark_for_close()  and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.","modified":"2026-09-09T09:00:12.329381814Z","published":"2026-08-20T21:17:11.517Z","upstream":["CVE-2026-77641"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-77641"}],"affected":[{"package":{"name":"tor","ecosystem":"Debian:12","purl":"pkg:deb/debian/tor?arch=source&distro=bookworm"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77641.json"}},{"package":{"name":"tor","ecosystem":"Debian:13","purl":"pkg:deb/debian/tor?arch=source&distro=trixie"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77641.json"}},{"package":{"name":"tor","ecosystem":"Debian:14","purl":"pkg:deb/debian/tor?arch=source&distro=forky"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77641.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"}]}