Answer in brief
CVE-2026-33173 records a Unknown severity vulnerability in Rails Active Storage has possible content type bypass via metadata in direct uploads. 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 Active Storage's `DirectUploadsController` accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like `identified` and `analyzed` are stored in the same metadata hash, a malicious direct-upload client could set these flags. ### Releases The fixed releases are available at the normal locations. ### Credit This was responsible reported by Hackerone researcher [pwnie](https://hackerone.com/pwnie)
Quoted source text, attributed separately from HOL analysis.