CVE-2026-77638

EUVD-2026-63647
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.
Race Condition
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.9 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 20.48%
Affected Products (NVD)
VendorProductVersion
torprojecttor
𝑥
< 0.4.9.11
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
tor
bookworm
0.4.9.11-0+deb12u1
fixed
bookworm (security)
0.4.9.11-0+deb12u1
fixed
forky
0.4.9.12-4
fixed
sid
0.4.9.13-1
fixed
trixie
0.4.9.11-0+deb13u1
fixed
trixie (security)
0.4.9.13-0+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
tor
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage