Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
Published: March 23, 2026
SECURITY IDENTIFIERS
- CVE: CVE-2026-33169 (NVD)
- GHSA: GHSA-cg4j-q9v8-6v38
- Vendor Advisory: https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
GEM
FRAMEWORK
PATCHED VERSIONS
~> 7.2.3, >= 7.2.3.1
~> 8.0.4, >= 8.0.4.1
>= 8.1.2.1
DESCRIPTION
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.
RELATED
- https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
- 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/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/advisories/GHSA-cg4j-q9v8-6v38