Answer in brief
CVE-2026-33176 records a Unknown severity vulnerability in Rails Active Support has a possible DoS vulnerability in its number helpers. The current sources do not mark it as known exploited. The current feed maps activesupport (rubygems), activesupport (rubygems), activesupport (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 activesupport (rubygems), activesupport (rubygems), activesupport (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| activesupportrubygems | >=8.1.0.beta1 <8.1.2.1 | 8.1.2.1 |
| activesupportrubygems | >=8.0.0.beta1 <8.0.4.1 | 8.0.4.1 |
| activesupportrubygems | >=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 Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which when converted to a string could be expanded into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. ### Releases The fixed releases are available at the normal locations. ### Credit This issue was responsibly reported by Hackerone researcher [manun](https://hackerone.com/manun).
Quoted source text, attributed separately from HOL analysis.