CVE-2026-77638

Race Condition Enables Rendezvous Point to Impersonate Onion Service in Tor

Published Aug 20, 2026 CVSS 3.1 · 8.9 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Title Race Condition Enables Rendezvous Point to Impersonate Onion Service in Tor
Type Values Removed Values Added
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.
First Time appeared Torproject
Torproject tor
Weaknesses CWE-362
CPEs cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*
Vendors & Products Torproject
Torproject tor
References
Metrics cvssV3_1

{'score': 8.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Aug 27, 2026, 4:06 PM
Reserved
Aug 20, 2026, 8:52 PM
Status
Analyzed
Published
Aug 20, 2026, 9:17 PM
Modified
Oct 18, 2026, 8:10 PM