Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
### 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).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-33169US | medium5.3 | — | ||
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/rails/railsPACKAGE
- https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11WEB
- https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974WEB
- https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49WEB
- https://github.com/rails/rails/releases/tag/v7.2.3.1WEB
- https://github.com/rails/rails/releases/tag/v8.0.4.1WEB
- https://github.com/rails/rails/releases/tag/v8.1.2.1WEB
- https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38WEB
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