CVE-2026-77641

Published: Ago 20, 2026 Last Modified: Ago 20, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,5
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: high

Description

AI Translation Available

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.

252

Unchecked Return Value

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Integrity
Potential Impacts:
Unexpected State Dos: Crash, Exit, Or Restart
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: Low
View CWE Details
https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.…
https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLog