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CVE-2026-77641

8.2 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.2 · torprojectNVD modified 2026-10-18 20:10

Affected (CPE criteria) 1

  • cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*

References 1