Answer in brief
CVE-2026-33174 records a Unknown severity vulnerability in Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests. The current sources do not mark it as known exploited. The current feed maps activestorage (rubygems), activestorage (rubygems), activestorage (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps activestorage (rubygems), activestorage (rubygems), activestorage (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| activestoragerubygems | >=8.1.0.beta1 <8.1.2.1 | 8.1.2.1 |
| activestoragerubygems | >=8.0.0.beta1 <8.0.4.1 | 8.0.4.1 |
| activestoragerubygems | >=0 <7.2.3.1 | 7.2.3.1 |
Published upstream
Mar 23, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
### Impact When serving files through Active Storage's `Blobs::ProxyController`, the 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. ### Releases The fixed releases are available at the normal locations. ### Credit This issue was responsibly reported by Hackerone user [pirikara](https://hackerone.com/pirikara)
Quoted source text, attributed separately from HOL analysis.