{"cve":"CVE-2026-33176","nvd":{"published":"2026-03-24T00:16:28.807","modified":"2026-06-17T10:37:05.023","status":"Analyzed","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","score":6.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-770"],"references":["https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb","https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a","https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856","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-2026-33176","score":0.00858,"percentile":0.58455,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2j26-frm8-cmj9","url":"https://osv.dev/vulnerability/GHSA-2j26-frm8-cmj9","summary":"Rails Active Support has a possible DoS vulnerability in its number helpers","modified":"2026-09-10T03:50:36.417316407Z","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."]}