CVE-2026-77641EPSS p26.7%
CVE-2026-77641CVE-2026-77641
torproject / tor
Description
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.
Scoring
| CVSS | 6.5 () |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H |
| EPSS | 0.35% probability of exploitation · percentile 26.7% · 2026-10-05T12:00:23Z |
| Last modified | 2026-09-08 |