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CVE-2025-6442— Ruby WEBrick read_header HTTP Request Smuggling Vulnerability

Quick assessment

Affected
Ruby WEBrick
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.

Webrick是The Ruby Programming Language开源的一个 HTTP 服务器工具包。 Webrick存在环境问题漏洞，该漏洞源于read_headers方法对HTTP标头终止符解析不一致，可能导致HTTP请求夹带攻击。

AI Predicted 8.1 Difficulty: Easy EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1102.003 · One-Way Communication
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I. Basic Information for CVE-2025-6442

Vulnerability Information
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Vulnerability Title
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Webrick 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Webrick是The Ruby Programming Language开源的一个 HTTP 服务器工具包。 Webrick存在环境问题漏洞，该漏洞源于read_headers方法对HTTP标头终止符解析不一致，可能导致HTTP请求夹带攻击。
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
Ruby WEBrick 1.8.1 -

II. Public POCs for CVE-2025-6442

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III. Intelligence Information for CVE-2025-6442

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IV. Related Vulnerabilities

Same vendor: Ruby
Same weakness: CWE-444

V. Comments for CVE-2025-6442

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