{"id":"CVE-2024-25126","aliases":["GHSA-22f2-v57c-j9cx"],"url":"https://o3.security/vulnerability/CVE-2024-25126","summary":"Rack ReDos in content type parsing (2nd degree polynomial)","details":"### Summary\n\n```ruby\nmodule Rack\n  class MediaType\n    SPLIT_PATTERN = %r{\\s*[;,]\\s*}\n```\nThe above regexp is subject to ReDos. 50K blank characters as a prefix to the header will take over 10s to split.\n\n### PoC\n\nA simple HTTP request with lots of blank characters in the content-type header:\n\n```ruby\nrequest[\"Content-Type\"] = (\" \" * 50_000) + \"a,\"\n```\n\n### Impact\n\nIt's a very easy to craft ReDoS. Like all ReDoS the impact is debatable.","published":"2024-02-28T23:28:07.073Z","modified":"2026-08-12T03:51:35.304833579Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.35376,"percentile":0.9835,"asOf":"2026-09-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"rack","fixedVersion":"3.0.9.1"},{"ecosystem":"RubyGems","name":"rack","fixedVersion":"2.2.8.1"}],"fix":{"url":"https://github.com/rack/rack/commit/6efb2ceea003c4b195815a614e00438cbd543462","label":"rack/rack@6efb2ce"},"references":[{"type":"WEB","url":"https://discuss.rubyonrails.org/t/denial-of-service-vulnerability-in-rack-content-type-parsing/84941"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/25xxx/CVE-2024-25126.json"},{"type":"ADVISORY","url":"https://github.com/rack/rack/security/advisories/GHSA-22f2-v57c-j9cx"},{"type":"ADVISORY","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-25126.yml"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-25126"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240510-0005/"},{"type":"FIX","url":"https://github.com/rack/rack/commit/6efb2ceea003c4b195815a614e00438cbd543462"},{"type":"FIX","url":"https://github.com/rack/rack/commit/d9c163a443b8cadf4711d84bd2c58cb9ef89cf49"},{"type":"PACKAGE","url":"https://github.com/rack/rack"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20240510-0005"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:35.304833579Z"}}