8.9High

CVE-2026-77638

torproject Tor Published: 2026-08-20 23:52 (2 months ago)

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.

Weakness (CWE): CWE-362

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

Vendor	Product	Versions
torproject	Tor	0.3.5.3-alpha – < 0.4.9.11

References and patches

https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog Permissions RequiredRelease NotesVendor Advisory

CPE matches (NVD) (1)

cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:* < 0.4.9.11

CVSS score

8.9High

Source: mitre · CVSS 3.1

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
Availability: Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

All scores (3)

cna	CVSS 3.1	8.9High
cve@mitre.org	CVSS 3.1	8.9High
nvd	CVSS 3.1	9.0Critical

EPSS (chance of exploitation in 30 days)

0.30%

higher than 23% of all CVEs

CISA assessment (SSVC)

Exploitation: none
Automatable: no
Technical impact: total

Timeline

ID reserved2026-08-20
Published2026-08-20 23:52
Reached IP-DB2026-10-24 23:47
Last updated2026-10-18 23:10

Assigned by (CNA): mitre
NVD status: Analyzed

View at source: CVE.org · NVD

Get told when these products get a new vulnerability

Turn on email alerts

Free · with an account · switch off any time