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CVE-2026-87724

Quick assessment

Affected
torprject Tor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tor是Tor组织开源的一个虚拟隧道网络。 Tor 0.4.9.12之前版本存在权限许可和访问控制问题漏洞，该漏洞源于即使在未发送CC_REQUEST时也解释CC_RESPONSE扩展，导致拥塞控制状态损坏，可能允许远程攻击者造成拒绝服务（崩溃）。

CVSS 6.5 · Medium EPSS 0.43% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
torprject Tor 0.4.9.3-alpha< 0.4.9.12 affected
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I. Basic Information for CVE-2026-87724

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在范围间的资源转移不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Tor 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tor是Tor组织开源的一个虚拟隧道网络。 Tor 0.4.9.12之前版本存在权限许可和访问控制问题漏洞，该漏洞源于即使在未发送CC_REQUEST时也解释CC_RESPONSE扩展，导致拥塞控制状态损坏，可能允许远程攻击者造成拒绝服务（崩溃）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
torprject Tor 0.4.9.3-alpha ~ 0.4.9.12 -

II. Public POCs for CVE-2026-87724

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III. Intelligence Information for CVE-2026-87724

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Patches & Fixes for CVE-2026-87724 (1)

Other References for CVE-2026-87724 (1)

IV. Related Vulnerabilities

Same product: Tor
Same weakness: CWE-669