VULNERABILITY INTELLIGENCE

CVE-2026-77641

CVSS score6.5 MEDIUM
EPSS probability0.35%
CISA KEVNot currently listed
Published2026-08-20
Last modified2026-10-18
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

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.

Weakness classification

  • CWE-252: Unchecked Return Value

Primary references