{"id":"CVE-2026-33176","aliases":["GHSA-2j26-frm8-cmj9"],"url":"https://o3.security/vulnerability/CVE-2026-33176","summary":"Rails Active Support has a possible DoS vulnerability in its number helpers","details":"Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.","published":"2026-03-23T23:29:27.933Z","modified":"2026-09-09T03:47:47.390388790Z","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/19dbab51ca086a657bb86458042bc44314916bcb","label":"rails/rails@19dbab5"},"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-2026-33176.json"},{"type":"ADVISORY","url":"https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33176"},{"type":"FIX","url":"https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb"},{"type":"FIX","url":"https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a"},{"type":"FIX","url":"https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856"},{"type":"PACKAGE","url":"https://github.com/rails/rails"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33176.yml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-09T03:47:47.390388790Z"}}