GHSA-cg4j-q9v8-6v38
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | activesupport | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
| RubyGems | activesupport | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
| RubyGems | activesupport | < 7.2.3.1 | 7.2.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### 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).
References
External links from the advisory. They lead to third-party sites.
- https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
- https://nvd.nist.gov/vuln/detail/CVE-2026-33169
- https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11
- https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
- https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49
- https://github.com/rails/rails
- https://github.com/rails/rails/releases/tag/v7.2.3.1
- https://github.com/rails/rails/releases/tag/v8.0.4.1
- https://github.com/rails/rails/releases/tag/v8.1.2.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33169.yml