CVE-2026-77638: Torproject Tor

Critical severity, CVSS 9.0. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Torproject Tor: before 0.4.9.11 (fixed in 0.4.9.11)

Published 2026-08-20. Last modified 2026-09-16.