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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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-23 | Updated 2026-03-24 | Assigner GitHub_M




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-400: Uncontrolled Resource Consumption

CWE-1333: Inefficient Regular Expression Complexity

Product status

>= 8.1.0.beta1, < 8.1.2.1
affected

>= 8.0.0.beta1, < 8.0.4.1
affected

< 7.2.3.1
affected

References

github.com/.../rails/security/advisories/GHSA-cg4j-q9v8-6v38

github.com/...ommit/29154f1097da13d48fdb3200760b3e3da66dcb11

github.com/...ommit/b54a4b373c6f042cab6ee2033246b1c9ecc38974

github.com/...ommit/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

cve.org (CVE-2026-33169)

nvd.nist.gov (CVE-2026-33169)

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