Vulnerability Description
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rubyonrails | Rails | < 7.2.3.1 |
Related Weaknesses (CWE)
References
- https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11Patch
- https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974Patch
- https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49Patch
- https://github.com/rails/rails/releases/tag/v7.2.3.1Release Notes
- https://github.com/rails/rails/releases/tag/v8.0.4.1Release Notes
- https://github.com/rails/rails/releases/tag/v8.1.2.1Release Notes
- https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38Vendor Advisory
FAQ
What is CVE-2026-33169?
CVE-2026-33169 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to ins...
How severe is CVE-2026-33169?
CVE-2026-33169 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33169?
Check the references section above for vendor advisories and patch information. Affected products include: Rubyonrails Rails.