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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.

torproject Tor是torproject组织开源的一款匿名通信软件。 torproject Tor 0.4.9.9之前版本存在缓冲区错误漏洞，该漏洞源于解析具有意外签名摘要类型的共识或分离签名时存在越界写入，可能导致目录权威遭受严重影响。

CVSS 7.5 · High EPSS 0.35% · P27

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
Vulnerability Title
torproject Tor 缓冲区错误漏洞
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 0.4.9.9之前版本存在缓冲区错误漏洞，该漏洞源于解析具有意外签名摘要类型的共识或分离签名时存在越界写入，可能导致目录权威遭受严重影响。
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 0.2.8.2-alpha ~ 0.4.9.9 -

II. Public POCs for CVE-2026-77642

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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 torproject Tor 竞争条件问题漏洞
CVE-2026-77584 7.0 HIGH torproject Tor 竞争条件问题漏洞
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-787

V. Comments for CVE-2026-77642

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