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.

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History

Thu, 27 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 21 Aug 2026 01:45:00 +0000

Type Values Removed Values Added
Title NULL Write After Free in Tor Relay Leading to Crash

Thu, 20 Aug 2026 21:15:00 +0000

Type Values Removed Values Added
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.
First Time appeared Torproject
Torproject tor
Weaknesses CWE-252
CPEs cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*
Vendors & Products Torproject
Torproject tor
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-27T16:06:56.149Z

Reserved: 2026-08-20T21:09:40.882Z

Link: CVE-2026-77641

cve-icon Vulnrichment

Updated: 2026-08-27T15:48:25.346Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-20T21:17:11.517

Modified: 2026-09-08T18:23:16.410

Link: CVE-2026-77641

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-21T01:30:05Z

Weaknesses