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CVE-2026-44837— view_component: System Test Entry Point Path Check Allows Sibling Directory Escape

Quick assessment

Affected
ViewComponent view_component
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.

view_component是ViewComponent开源的一个用于构建可复用、可测试视图组件的框架。 view_component 3.0.0版本至4.9.0版本存在安全漏洞，该漏洞源于系统测试入口点使用File.realpath规范化用户控制的文件路径后，仅检查解析路径是否以临时目录路径开头，但未进行安全包含检查，因为同级目录可共享相同字符串前缀。

CVSS 5.9 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
ViewComponent view_component >= 3.0.0, < 4.9.0 affected
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I. Basic Information for CVE-2026-44837

Vulnerability Information
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Vulnerability Title
view_component: System Test Entry Point Path Check Allows Sibling Directory Escape
Source: CVE Program / CVE List V5
Vulnerability Description
view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. From 3.0.0 to 4.9.0, the system test entrypoint canonicalizes a user-controlled file path with File.realpath, then checks whether the resolved path starts with the temp directory path. This is not a safe containment check because sibling directories can share the same string prefix. This vulnerability is fixed in 4.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
部分比较
Source: CVE Program / CVE List V5
Vulnerability Title
view_component 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
view_component是ViewComponent开源的一个用于构建可复用、可测试视图组件的框架。 view_component 3.0.0版本至4.9.0版本存在安全漏洞，该漏洞源于系统测试入口点使用File.realpath规范化用户控制的文件路径后，仅检查解析路径是否以临时目录路径开头，但未进行安全包含检查，因为同级目录可共享相同字符串前缀。
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
ViewComponent view_component >= 3.0.0, < 4.9.0 -

II. Public POCs for CVE-2026-44837

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III. Intelligence Information for CVE-2026-44837

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Vendor Advisories for CVE-2026-44837 (1)

IV. Related Vulnerabilities

Same product: view_component
Same vendor: ViewComponent
Same weakness: CWE-187

V. Comments for CVE-2026-44837

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