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CVE-2026-66066— Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing

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社区开源的一套基于Ruby语言的开源Web应用框架。 Rails 7.2.3.2之前版本、8.0.5.1之前版本和8.1.3.1之前版本存在配置错误漏洞，该漏洞源于Active Storage未禁用libvips中针对不可信内容标记为不安全的操作，允许特制上传触发该操作，可能导致未经身份验证的攻击者读取Rails进程可访问的任意文件，包括环境变量和应用密钥。

CVSS 9.5 · Critical EPSS 2.10% · P81

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 3

VendorProduct Version RangeStatus
rails rails < 7.2.3.2 affected
>= 8.0.0.beta1, < 8.0.5.1 affected
>= 8.1.0.beta1, < 8.1.3.1 affected
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I. Basic Information for CVE-2026-66066

Vulnerability Information
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Vulnerability Title
Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
Source: CVE Program / CVE List V5
Vulnerability Description
Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
不安全的默认资源初始化
Source: CVE Program / CVE List V5
Vulnerability Title
Rails 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rails是美国Rails社区开源的一套基于Ruby语言的开源Web应用框架。 Rails 7.2.3.2之前版本、8.0.5.1之前版本和8.1.3.1之前版本存在配置错误漏洞，该漏洞源于Active Storage未禁用libvips中针对不可信内容标记为不安全的操作，允许特制上传触发该操作，可能导致未经身份验证的攻击者读取Rails进程可访问的任意文件，包括环境变量和应用密钥。
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 < 7.2.3.2 -

II. Public POCs for CVE-2026-66066

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9043 chars
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In-depth vulnerability mechanism
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-66066

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Patches & Fixes for CVE-2026-66066 (4)

Vendor Advisories for CVE-2026-66066 (2)

News Coverage for CVE-2026-66066 (1)

Vendor Pages for CVE-2026-66066 (1)

Other References for CVE-2026-66066 (1)

IV. Related Vulnerabilities

Same product: rails
Same vendor: rails
Same weakness: CWE-1188

V. Comments for CVE-2026-66066

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