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CVE-2026-77584

Quick assessment

Affected
torproject 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.

torproject Tor是torproject组织开源的一款匿名通信软件。 torproject Tor 0.4.9.10之前版本存在竞争条件问题漏洞，该漏洞源于未拒绝已附加流的电路上收到的CONFLUX_LINK信元，恶意客户端可在CONFLUX_LINK之前发送RELAY_COMMAND_BEGIN，导致退出流成为孤儿并留下悬空电路反向指针，在电路释放时造成释放后重用。

CVSS 7.0 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
torproject Tor 0.4.8.1-alpha< 0.4.9.10 affected
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I. Basic Information for CVE-2026-77584

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit back-pointer and a use-after-free (UAF) when the circuit is freed. This is TROVE-2026-025.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的同步机制
Source: CVE Program / CVE List V5
Vulnerability Title
torproject Tor 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
torproject Tor是torproject组织开源的一款匿名通信软件。 torproject Tor 0.4.9.10之前版本存在竞争条件问题漏洞，该漏洞源于未拒绝已附加流的电路上收到的CONFLUX_LINK信元，恶意客户端可在CONFLUX_LINK之前发送RELAY_COMMAND_BEGIN，导致退出流成为孤儿并留下悬空电路反向指针，在电路释放时造成释放后重用。
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
torproject Tor 0.4.8.1-alpha ~ 0.4.9.10 -

II. Public POCs for CVE-2026-77584

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III. Intelligence Information for CVE-2026-77584

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Vendor Pages for CVE-2026-77584 (1)

Same Patch Batch · torproject · 2026-08-20 · 7 CVEs total

CVE-2026-77638 8.9 HIGH torproject Tor 竞争条件问题漏洞
CVE-2026-77642 7.5 HIGH torproject Tor 缓冲区错误漏洞
CVE-2026-77641 6.5 MEDIUM torproject Tor 异常处理不当漏洞
CVE-2026-77587 5.9 MEDIUM torproject Tor 资源管理错误漏洞
CVE-2026-77639 5.3 MEDIUM torproject Tor 授权问题漏洞
CVE-2026-77640 3.7 LOW torproject Tor 输入验证错误漏洞

IV. Related Vulnerabilities

Same product: Tor
Same vendor: torproject
Same weakness: CWE-821

V. Comments for CVE-2026-77584

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