{"id":"CVE-2026-77584","title":"Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams","summary":"Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit strea…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","cwe":["CWE-821"],"vendor":"torproject","product":"tor","affected":["tor < 0.4.9.10"],"patched":["tor 0.4.9.10"],"published":"2026-08-20","updated":"2026-09-16","sourceUpdated":"2026-09-16T14:15:12.163","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77584","references":[{"url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.10/ChangeLog","label":"cve@mitre.org"}],"tags":["nvd"],"epss":0.00177,"epssPercentile":0.07538,"ingestedAt":"2026-09-16T14:57:28.001Z","slug":"CVE-2026-77584","body":"## Overview\n\nTor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit back-pointer and a use-after-free (UAF) when the circuit is freed. This is TROVE-2026-025.\n\n## Affected\n\n- `tor < 0.4.9.10`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `tor 0.4.9.10`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}