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  5. CVE-2026-33169

CVE-2026-33169: Rails Active Support has a possible ReDoS vulnerability in number_to_delimited

March 23, 2026

NumberToDelimitedConverter used a regular expression with gsub! to insert thousands delimiters. This could produce quadratic time complexity on long digit strings.

References

  • github.com/advisories/GHSA-cg4j-q9v8-6v38
  • github.com/rails/rails
  • github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11
  • github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974
  • github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49
  • github.com/rails/rails/releases/tag/v7.2.3.1
  • github.com/rails/rails/releases/tag/v8.0.4.1
  • github.com/rails/rails/releases/tag/v8.1.2.1
  • github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38
  • nvd.nist.gov/vuln/detail/CVE-2026-33169

Code Behaviors & Features

Detect and mitigate CVE-2026-33169 with GitLab Dependency Scanning

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Affected versions

All versions starting from 8.1.0.beta1 before 8.1.2.1, all versions starting from 8.0.0.beta1 before 8.0.4.1, all versions before 7.2.3.1

Fixed versions

  • 8.1.2.1
  • 8.0.4.1
  • 7.2.3.1

Solution

Upgrade to versions 7.2.3.1, 8.0.4.1, 8.1.2.1 or above.

Impact 5.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Learn more about CVSS

Weakness

  • CWE-1333: Inefficient Regular Expression Complexity
  • CWE-400: Uncontrolled Resource Consumption

Source file

gem/activesupport/CVE-2026-33169.yml

Spotted a mistake? Edit the file on GitLab.

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