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CVE-2026-77587

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.

Tor 0.4.9.11 之前的版本存在一个使用后释放（use-after-free）及潜在的双重释放（double free）漏洞。当恢复路径重新激活一个 conflux 集合，且该集合中最后一个已链接的路径已被关闭时，便会触发此漏洞。恶意出口节点可利用此漏洞导致客户端崩溃。该漏洞标识为 TROVE-2026-026。

CVSS 5.9 · Medium EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
torproject Tor 0.4.8.1-alpha< 0.4.9.11 affected
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I. Basic Information for CVE-2026-77587

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
引用计数的更新不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
torproject Tor 0.4.8.1-alpha ~ 0.4.9.11 -

II. Public POCs for CVE-2026-77587

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77587

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Patches & Fixes for CVE-2026-77587 (1)

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

CVE-2026-77638 8.9 HIGH Tor <0.4.9.11中间人竞争条件漏洞
CVE-2026-77642 7.5 HIGH Tor <0.4.9.9共识解析越界写入漏洞
CVE-2026-77584 7.0 HIGH Tor <0.4.9.10 释放后使用漏洞
CVE-2026-77641 6.5 MEDIUM Tor 0.4.9.9前版本释放后空指针写入漏洞
CVE-2026-77639 5.3 MEDIUM Tor <0.4.9.9 压缩炸弹绕过漏洞
CVE-2026-77640 3.7 LOW Tor <0.4.9.9 zlib截断流无限循环漏洞

IV. Related Vulnerabilities

Same product: Tor
Same vendor: torproject
Same weakness: CWE-911

V. Comments for CVE-2026-77587

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