MEDIUM
GHSA-cg4j-q9v8-6v38
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
Details
### 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
RubyGems / activesupport
Introduced in:
8.1.0.beta1 Fixed in: 8.1.2.1 Fix
bundle update activesupport RubyGems / activesupport
Introduced in:
8.0.0.beta1 Fixed in: 8.0.4.1 Fix
bundle update activesupport 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]