Answer in brief
CVE-2026-33169 records a Unknown severity vulnerability in Rails Active Support has a possible ReDoS vulnerability in number_to_delimited. 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 `NumberToDelimitedConverter` used a regular expression with `gsub!` to insert thousands delimiters. This could produce quadratic time complexity on long digit strings. ### Releases The fixed releases are available at the normal locations. ### Credit This issue was responsibly reported by Hackerone researcher [scyoon](https://hackerone.com/scyoon).
Quoted source text, attributed separately from HOL analysis.