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CVE-2024-26142— Rails possible ReDoS vulnerability in Accept header parsing in Action Dispatch

Quick assessment

Affected
rails rails
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails 7.1.0至7.1.3.1之前版本存在安全漏洞，该漏洞源于Action Dispatch的Accept标头解析例程中存在正则表达式拒绝服务（ReDoS）漏洞。

CVSS 7.5 · High EPSS 1.50% · P73

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2024-26142

Vulnerability Information
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Vulnerability Title
Rails possible ReDoS vulnerability in Accept header parsing in Action Dispatch
Source: CVE Program / CVE List V5
Vulnerability Description
Rails is a web-application framework. Starting in version 7.1.0, there is a possible ReDoS vulnerability in the Accept header parsing routines of Action Dispatch. This vulnerability is patched in 7.1.3.1. Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Rails 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 Rails 7.1.0至7.1.3.1之前版本存在安全漏洞，该漏洞源于Action Dispatch的Accept标头解析例程中存在正则表达式拒绝服务（ReDoS）漏洞。
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
rails rails >= 7.1.0, < 7.1.3.1 -

II. Public POCs for CVE-2024-26142

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7405 chars
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III. Intelligence Information for CVE-2024-26142

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Patches & Fixes for CVE-2024-26142 (1)

Vendor Advisories for CVE-2024-26142 (2)

Other References for CVE-2024-26142 (2)

Same Patch Batch · rails · 2024-02-27 · 3 CVEs total

CVE-2024-26143 6.1 MEDIUM Rails Possible XSS Vulnerability in Action Controller
CVE-2024-26144 5.3 MEDIUM Possible Sensitive Session Information Leak in Active Storage

IV. Related Vulnerabilities

Same product: rails
Same vendor: rails
Same weakness: CWE-1333

V. Comments for CVE-2024-26142

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