{"id":"CVE-2026-33169","aliases":["GHSA-cg4j-q9v8-6v38"],"url":"https://o3.security/vulnerability/CVE-2026-33169","summary":"Rails Active Support has a possible ReDoS vulnerability in number_to_delimited","details":"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":"2026-03-23T23:07:07.630Z","modified":"2026-08-07T11:49:52.550972552Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"activesupport","fixedVersion":"8.1.2.1"},{"ecosystem":"RubyGems","name":"activesupport","fixedVersion":"8.0.4.1"},{"ecosystem":"RubyGems","name":"activesupport","fixedVersion":"7.2.3.1"}],"fix":{"url":"https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11","label":"rails/rails@29154f1"},"references":[{"type":"WEB","url":"https://github.com/rails/rails/releases/tag/v7.2.3.1"},{"type":"WEB","url":"https://github.com/rails/rails/releases/tag/v8.0.4.1"},{"type":"WEB","url":"https://github.com/rails/rails/releases/tag/v8.1.2.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33169.json"},{"type":"ADVISORY","url":"https://github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33169"},{"type":"FIX","url":"https://github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11"},{"type":"FIX","url":"https://github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974"},{"type":"FIX","url":"https://github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:49:52.550972552Z"}}