ruby-advisory-db/gems/activesupport/CVE-2026-33169.yml at 03c7702be716a958a2e0b095e08c2ab0736cd55e · rubysec/ruby-advisory-db · GitHub

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---
gem: activesupport
framework: rails
cve: 2026-33169
ghsa: cg4j-q9v8-6v38
url: https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
title: Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
date: 2026-03-23
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.
patched_versions:
  - "~> 7.2.3, >= 7.2.3.1"
  - "~> 8.0.4, >= 8.0.4.1"
  - ">= 8.1.2.1"
related:
  url:
    - 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