CVE-2026-33169
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
- State
- Published
- Severity
- 6.9 Medium
- Published
- Mar 23, 2026
- Updated
- Mar 24, 2026
- Reserved
- Mar 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
activesupportrails |
|
References
- 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
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