MEDIUMVulnerability
CVE-2026-77641
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.
Properties
- severity
- MEDIUM
- score
- 6.5
- epss_score
- 0.00194
- cve_id
- CVE-2026-77641
- vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
- published_at
- 2026-08-20T21:17:11.517
- last_modified
- 2026-09-03T17:24:13.970
- epss_percentile
- 0.09133
Related Entities (3)
ENRICHED_BY (1)
→[Source]FIRST EPSS
HAS_WEAKNESS (1)
→[Weakness]Unchecked Return Value
DESCRIBED_BY (1)
→[Source]NVD
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