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HIGH · 8.9

CVE-2026-77638

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.

Vulnerability 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.

CVSS Score

8.9

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW

Related Weaknesses (CWE)

CWE-362

References

FAQ

What is CVE-2026-77638?

CVE-2026-77638 is a vulnerability with a CVSS score of 8.9 (HIGH). 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.

How severe is CVE-2026-77638?

CVE-2026-77638 has been rated HIGH with a CVSS base score of 8.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-77638?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.