MEDIUM
GHSA-cg4j-q9v8-6v38
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
Quick fix
GHSA-cg4j-q9v8-6v38 — activesupport: upgrade to the fixed version with the command below.
bundle update activesupportDetails
### 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).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-33169[ADVISORY]
- https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11[WEB]
- https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974[WEB]
- https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49[WEB]
- https://github.com/rails/rails[PACKAGE]
- https://github.com/rails/rails/releases/tag/v7.2.3.1[WEB]
- https://github.com/rails/rails/releases/tag/v8.0.4.1[WEB]
- https://github.com/rails/rails/releases/tag/v8.1.2.1[WEB]
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33169.yml[WEB]