by Kastro
Paper/Archive/CVE-2026-77638

CVE-2026-77638

torproject Tor — 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 (impers…

EPSS 0.3%CVSS 9.0
critical.is priorityof 100
32
CVSS 9.0 (NVD)9.0 / 10 × 3027.0Not in CISA KEV+300.0EPSS percentile 22.5.225 × 204.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Tor0.3.5.3-alpha – < 0.4.9.110.4.9.11CNA

Scores by source

NVD9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
mitre (CNA)8.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog