CVE-2026-33174— Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的内存分配
Source: NVD (National Vulnerability Database)
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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- Release 8.1.2.1 · rails/rails · GitHubx_refsource_MISC
- Release 8.0.4.1 · rails/rails · GitHubx_refsource_MISC
- Release 7.2.3.1 · rails/rails · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33174
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-2026-33658
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 - CVE-2026-33173
Rails Active Storage has possible content type bypass via me
Same weakness: CWE-789
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memono Notepad 4.2 Denial of Service via Buffer Overflow - CVE-2026-42241
ParquetSharp: Possible Stack Overflow When Reading a Parquet - CVE-2026-43868
Apache Thrift: Rust implementation vulnerable to CVE-2020-13 - CVE-2026-42146
CImg Library: Uncontrolled memory allocation via nb_colors f - CVE-2026-42440
Apache OpenNLP: OOM DoS via Unbounded Array Allocation in Ab
V. Comments for CVE-2026-33174
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