CVE-2026-33174— Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-33174
Vulnerability Information
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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
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Patches & Fixes for CVE-2026-33174 (4)
- Release 7.2.3.1 · rails/rails · GitHubx_refsource_MISC
Vendor Advisories for CVE-2026-33174 (1)
Vendor Pages for CVE-2026-33174 (2)
- Release 8.1.2.1 · rails/rails · GitHubx_refsource_MISC
- Release 8.0.4.1 · rails/rails · GitHubx_refsource_MISC
Same Patch Batch · rails · 2026-03-23 · 9 CVEs total
| 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-2026-33195 | Rails Active Storage has possible Path Traversal in DiskService | |
| CVE-2026-33202 | Rails Active Storage has possible glob injection in its DiskService |
IV. Related Vulnerabilities
Same product: activestorage
- CVE-2026-33658
Rails Active Storage has a possible DoS vulnerability in pro - CVE-2026-33202
Rails Active Storage has possible glob injection in its Disk - CVE-2026-33195
Rails Active Storage has possible Path Traversal in DiskServ - CVE-2026-33173
Rails Active Storage has possible content type bypass via me - CVE-2025-24293
Active Storage 安全漏洞
Same vendor: rails
- CVE-2026-66066
Action Pack: Possible arbitrary file read and remote code ex - CVE-2026-33658
Rails Active Storage has a possible DoS vulnerability in pro - CVE-2026-33202
Rails Active Storage has possible glob injection in its Disk - CVE-2026-33195
Rails Active Storage has possible Path Traversal in DiskServ - CVE-2026-33176
Rails Active Support has a possible DoS vulnerability in its
Same weakness: CWE-789
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Sonic 3 A.I.R. Unbounded Memory Allocation DoS via ReceivedP - CVE-2026-70377
imagecli: Uncontrolled Memory Allocation via Unbounded scale - CVE-2026-61485
Apache Lucy: Freezer/InStream deserialization bomb - unbound - CVE-2026-67589
Apache Qpid ProtonJ2: Type size/count handling can lead to e - CVE-2026-67551
Apache Qpid Proton Dotnet: Type size/count handling can lead
V. Comments for CVE-2026-33174
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