{"id":"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.","aliases":["GHSA-cg4j-q9v8-6v38"],"modified":"2026-09-09T03:47:45.776530431Z","published":"2026-03-23T23:07:07.630Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-1333","CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33169.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rails/rails","events":[{"introduced":"0"},{"fixed":"ba76fca032a66f3716ca8a661c9ddb006acaf885"},{"introduced":"dd8f7185faeca6ee968a6e9367f6d8601a83b8db"},{"fixed":"a79efed95797b196575a98845dc989e3106a9acb"},{"introduced":"1cdd190a25e483b65f1f25bbd0f13a25d696b461"},{"fixed":"1db4b89687cc18311fc3f92623136705df24e671"},{"fixed":"29154f1097da13d48fdb3200760b3e3da66dcb11"},{"fixed":"b54a4b373c6f042cab6ee2033246b1c9ecc38974"},{"fixed":"ec1a0e215efd27a3b3911aae6df978a80f456a49"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"7.2.3.1"},{"introduced":"8.0.0"},{"fixed":"8.0.4.1"},{"introduced":"8.1.0"},{"fixed":"8.1.2.1"}]}}],"versions":["v7.2.3","v8.0.4","v8.1.2","v8.1.1","v8.1.0","v8.0.3","v8.0.2","v8.0.1","v8.0.0","v7.2.2","v7.2.1","v7.2.0.rc1","v7.2.0.beta3","v7.2.0.beta2","v7.2.0.beta1","v7.1.0.beta1","v7.0.0.alpha2","v7.0.0.alpha1","v6.1.0.rc1","v6.0.0.beta2","v6.0.0.beta1","v5.1.0.beta1","v5.0.0.beta4","v5.0.0.beta2","v5.0.0.beta1","v4.2.0.beta1","v4.0.0.rc1","v4.0.0.beta1","v3.2.0.rc1","v3.1.0.rc1","v3.1.0.beta1","v3.0.0.beta3","v3.0.0.beta.3","v2.0.1","v2.0.0","v2.0.0_RC2","v2.0.0_RC1","v2.0.0_PR","v1.1.1","v1.1.0","v1.1.0_RC1","v0.14.3","v0.14.1","v0.13.1","v0.13.0","v0.12.0","v0.11.1","v0.11.0","v0.10.1","v0.10.0","v0.9.5","v0.9.4.1","v0.9.4","v0.9.3","v0.9.2","v0.9.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33169.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}