Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-33174— Rails Active Storage has a possible DoS vulnerability when in proxy mode via 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将整个请求字节范围加载到内存中，可能导致内存耗尽引发拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-33174

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Rails Active Storage has a possible DoS vulnerability when in proxy mode via 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, when serving files through Active Storage's proxy delivery mode, the proxy controller loads the entire requested byte range into memory before sending it. A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion. 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:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
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将整个请求字节范围加载到内存中，可能导致内存耗尽引发拒绝服务。
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.beta1, < 8.1.2.1 -

II. Public POCs for CVE-2026-33174

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-33174

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-33174 (4)

Vendor Advisories for CVE-2026-33174 (1)

Vendor Pages for CVE-2026-33174 (2)

Same Patch Batch · rails · 2026-03-23 · 9 CVEs total

CVE-2026-33195 8.0 HIGH Rails Active Storage has possible Path Traversal in DiskService
CVE-2026-33167 Rails has a possible XSS vulnerability in its Action Pack debug exceptions
CVE-2026-33168 Rails has a possible XSS vulnerability in its Action View tag helpers
CVE-2026-33170 Rails Active Support has a possible XSS vulnerability in SafeBuffer#%
CVE-2026-33176 Rails Active Support has a possible DoS vulnerability in its number helpers
CVE-2026-33173 Rails Active Storage has possible content type bypass via metadata in direct uploads
CVE-2026-33169 Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
CVE-2026-33202 Rails Active Storage has possible glob injection in its DiskService

IV. Related Vulnerabilities

Same product: activestorage
Same vendor: rails
Same weakness: CWE-789

V. Comments for CVE-2026-33174

No comments yet

Leave a comment