CVE-2026-33169
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
4th
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.
| CWE | CWE-400 CWE-1333 |
| Vendor | rails |
| Product | activesupport |
| Published | Mar 23, 2026 |
| Last Updated | Mar 24, 2026 |
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Affected Versions
rails / activesupport
>= 8.1.0.beta1, < 8.1.2.1 >= 8.0.0.beta1, < 8.0.4.1 < 7.2.3.1
References
github.com: https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38 github.com: https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11 github.com: https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974 github.com: https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49 github.com: https://github.com/rails/rails/releases/tag/v7.2.3.1 github.com: https://github.com/rails/rails/releases/tag/v8.0.4.1 github.com: https://github.com/rails/rails/releases/tag/v8.1.2.1