CVE-2026-77638

Published: Aug 20, 2026Modified: Sep 3, 2026

8.9

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Exploitability: 2.2 / Impact: 6.0

Source: MITRE (Secondary)

Description

Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client was trying to reach.

Related CWEs

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

References (1)

https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog

Source: cve@mitre.org

Timeline

No history available yet.