CVE-2026-77638

criticalpriority · track · 36EPSS 0.003 · 22 %ileDEUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.30% (22nd) EPSS

CVSS 9 · critical

Is it mine?

5 products

Check your exposure

Who says so?

2 sources

cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

9.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.2–9

v3.19criticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.2 · impact 6

v3.18.9highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Lsecondary · cve@mitre.org USexploitability 2.2 · impact 6

v3.18.2highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-362US

affected products (5)

Products and version ranges known to be affected.

SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Open Source Tor< 0.4.9.10cert_bundDE
Open Source Tor< 0.4.9.11cert_bundDE
Open Source Tor< 0.4.9.9cert_bundDE
torproject tor< 0.4.9.11nvdUScpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2959Tor: Mehrere SchwachstellenDeutsch2026-08-20csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Tor ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, Informationen offenzulegen oder einen Denial-of-Service-Zustand herbeizuführen.

sources

Which sources assert this record, and when.

cert_bund nvd NVD CVE.org MITRE

published 2026-08-20modified 2026-10-18

references (1) nvd

External citations — patches, advisories, analysis.

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

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan