CVE-2026-77638: tor before 0.4.9.11 (exclusive); +1 more affected products

CVE-2026-77638. CVSS 3.1 base score 9.0 (CRITICAL, NVD). EPSS 0.00299 (percentile 0.21093), scored 17-Oct-2026.

Affected technology

tor · before 0.4.9.11 (exclusive)
torproject

Tor · 0.3.5.3-alpha to before 0.4.9.11
torproject

Description’s affected range: 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

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Vendor/CNA’s CVSS 3.1 assessment (base score 8.9/10) rates confidentiality and integrity impact as high; availability impact as low. NVD’s CVSS 3.1 assessment (base score 9.0/10) rates confidentiality, integrity and availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 18-Oct-2026 20:24 UTC

CWE: CWE-362
CCR priority: 36.1 /100 (P4)
CVSS 3.1: 9.0 /10 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H · NVD
EPSS: 0.00299 · percentile 0.21093 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-18 20:23:06.032219+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-77638.html