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CVE-2026-33658— Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests

Quick assessment

Affected
rails activestorage
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.

Rails是美国Rails团队的一套基于Ruby语言的开源Web应用框架。 rails Active Storage 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在安全漏洞，该漏洞源于代理控制器未限制HTTP Range标头中的字节范围数量，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-33658

Vulnerability Information
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Vulnerability Title
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests
Source: CVE Program / CVE List V5
Vulnerability Description
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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 Active Storage 8.1.2.1之前版本、8.0.4.1之前版本和7.2.3.1之前版本存在安全漏洞，该漏洞源于代理控制器未限制HTTP Range标头中的字节范围数量，可能导致拒绝服务攻击。
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
rails activestorage >= 8.1.0, < 8.1.2.1 -

II. Public POCs for CVE-2026-33658

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III. Intelligence Information for CVE-2026-33658

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Patches & Fixes for CVE-2026-33658 (1)

Vendor Advisories for CVE-2026-33658 (2)

Vendor Pages for CVE-2026-33658 (2)

IV. Related Vulnerabilities

Same product: activestorage
Same vendor: rails
Same weakness: CWE-770

V. Comments for CVE-2026-33658

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