{"action":"Upgrade rack to 3.1.21 or later.","affected":[{"fixed":"3.1.21","introduced":"3.0.0.beta1"},{"fixed":"3.2.6","introduced":"3.2.0"}],"component":"rack","cve_ids":["CVE-2026-34827"],"ecosystem":"RubyGems","epss":0.00475,"exploited":false,"fixed_versions":["3.1.21","3.2.6"],"ghsa_id":"GHSA-v6x5-cg8r-vv6x","id":"tcs_01M5KENFZAR67A82X0K71ZYR54","modified_at":"2026-09-10T03:50:44.804498177Z","published_at":"2026-04-02T20:30:12Z","references":["https://osv.dev/vulnerability/GHSA-v6x5-cg8r-vv6x","https://github.com/rack/rack/security/advisories/GHSA-v6x5-cg8r-vv6x","https://nvd.nist.gov/vuln/detail/CVE-2026-34827","https://github.com/rack/rack","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2026-34827.yml"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-v6x5-cg8r-vv6x","url":"https://osv.dev/vulnerability/GHSA-v6x5-cg8r-vv6x"}],"summary":"Rack's multipart header parsing allows Denial of Service via escape-heavy quoted parameters"}