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CVE-2026-77642

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.

在 Tor 0.4.9.9 之前的版本中，存在一个越界写入漏洞。当解析一致性文档（consensus）或分离签名（detached signature）时，若签名摘要类型不符合预期，将触发该漏洞。该漏洞对大多数 Tor 角色而言影响轻微，但对目录服务器（directory authorities）可能造成严重影响。此漏洞编号为 TROVE-2026-019。

CVSS 7.5 · High EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
torproject Tor 0.2.8.2-alpha< 0.4.9.9 affected
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I. Basic Information for CVE-2026-77642

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with unexpected signature digest type. Impact is minor for most Tor roles, but potentially major for directory authorities. This is TROVE-2026-019.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
torproject Tor 0.2.8.2-alpha ~ 0.4.9.9 -

II. Public POCs for CVE-2026-77642

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77642

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Other References for CVE-2026-77642 (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-2026-77584 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-2026-77587 5.9 MEDIUM Tor 0.4.9.11前存在释放后使用漏洞
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-787

V. Comments for CVE-2026-77642

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