CVE-2026-87724

Tor Pre‑0.4.9.12 Unchecked CC_RESPONSE Causes Denial of Service

Published Sep 9, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Torproject
Torproject tor
Vendors & Products Torproject
Torproject tor
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Tor Pre‑0.4.9.12 Unchecked CC_RESPONSE Causes Denial of Service
Type Values Removed Values Added
Description Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032.
Weaknesses CWE-669
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 9, 2026, 6:18 PM
Reserved
Sep 9, 2026, 1:29 AM
Status
Deferred
Published
Sep 9, 2026, 2:16 AM
Modified
Sep 9, 2026, 7:17 PM