{"id":"CVE-2024-26146","aliases":["GHSA-54rr-7fvw-6x8f"],"url":"https://o3.security/vulnerability/CVE-2024-26146","summary":"Possible Denial of Service Vulnerability in Rack Header Parsing","details":"# Possible Denial of Service Vulnerability in Rack Header Parsing\n\nThere is a possible denial of service vulnerability in the header parsing\nroutines in Rack.  This vulnerability has been assigned the CVE identifier\nCVE-2024-26146.\n\nVersions Affected:  All.\nNot affected:       None\nFixed Versions:     2.0.9.4, 2.1.4.4, 2.2.8.1, 3.0.9.1\n\nImpact\n------\nCarefully crafted headers can cause header parsing in Rack to take longer than\nexpected resulting in a possible denial of service issue. Accept and Forwarded\nheaders are impacted.\n\nRuby 3.2 has mitigations for this problem, so Rack applications using Ruby 3.2\nor newer are unaffected.\n\nReleases\n--------\nThe fixed releases are available at the normal locations.\n\nWorkarounds\n-----------\nThere are no feasible workarounds for this issue.\n\nPatches\n-------\nTo aid users who aren't able to upgrade immediately we have provided patches for\nthe two supported release series. They are in git-am format and consist of a\nsingle changeset.\n\n* 2-0-header-redos.patch - Patch for 2.0 series\n* 2-1-header-redos.patch - Patch for 2.1 series\n* 2-2-header-redos.patch - Patch for 2.2 series\n* 3-0-header-redos.patch - Patch for 3.0 series\n\nCredits\n-------\n\nThanks to [svalkanov](https://hackerone.com/svalkanov) for reporting this and\nproviding patches!","published":"2024-02-28T23:28:01.158Z","modified":"2026-08-12T03:51:45.642632295Z","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":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"rack","fixedVersion":"3.0.9.1"},{"ecosystem":"RubyGems","name":"rack","fixedVersion":"2.2.8.1"},{"ecosystem":"RubyGems","name":"rack","fixedVersion":"2.1.4.4"},{"ecosystem":"RubyGems","name":"rack","fixedVersion":"2.0.9.4"}],"fix":{"url":"https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716","label":"rack/rack@30b8e39"},"references":[{"type":"WEB","url":"https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942"},{"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/2024/26xxx/CVE-2024-26146.json"},{"type":"ADVISORY","url":"https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f"},{"type":"ADVISORY","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26146"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240510-0006/"},{"type":"FIX","url":"https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716"},{"type":"FIX","url":"https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582"},{"type":"FIX","url":"https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f"},{"type":"FIX","url":"https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd"},{"type":"PACKAGE","url":"https://github.com/rack/rack"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:45.642632295Z"}}