{"cve":"CVE-2026-33169","nvd":{"published":"2026-03-24T00:16:28.113","modified":"2026-06-17T10:37:04.240","status":"Analyzed","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.","cvss_v4":{"vector":"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","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-400","CWE-1333"],"references":["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"],"products":["rubyonrails:rails"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33169","score":0.00656,"percentile":0.51407,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-cg4j-q9v8-6v38","url":"https://osv.dev/vulnerability/GHSA-cg4j-q9v8-6v38","summary":"Rails Active Support has a possible ReDoS vulnerability in number_to_delimited","modified":"2026-09-10T03:50:38.710868605Z","packages":[{"ecosystem":"RubyGems","name":"activesupport","purl":"pkg:gem/activesupport","ranges":[">=8.1.0.beta1 <8.1.2.1"],"fixed":["8.1.2.1"]},{"ecosystem":"RubyGems","name":"activesupport","purl":"pkg:gem/activesupport","ranges":[">=8.0.0.beta1 <8.0.4.1"],"fixed":["8.0.4.1"]},{"ecosystem":"RubyGems","name":"activesupport","purl":"pkg:gem/activesupport","ranges":["<7.2.3.1"],"fixed":["7.2.3.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}