{"action":"Upgrade rack to 2.2.23 or later.","affected":[{"fixed":"2.2.23","introduced":"0"},{"fixed":"3.1.21","introduced":"3.0.0.beta1"},{"fixed":"3.2.6","introduced":"3.2.0"}],"component":"rack","cve_ids":["CVE-2026-34230"],"ecosystem":"RubyGems","epss":0.00447,"exploited":false,"fixed_versions":["2.2.23","3.1.21","3.2.6"],"ghsa_id":"GHSA-v569-hp3g-36wr","id":"tcs_01M5KENEGQRSPJ0G6SGGKYEGGQ","modified_at":"2026-09-10T03:51:03.178734762Z","published_at":"2026-04-02T20:32:19Z","references":["https://osv.dev/vulnerability/GHSA-v569-hp3g-36wr","https://github.com/rack/rack/security/advisories/GHSA-v569-hp3g-36wr","https://nvd.nist.gov/vuln/detail/CVE-2026-34230","https://github.com/rack/rack","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2026-34230.yml"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-v569-hp3g-36wr","url":"https://osv.dev/vulnerability/GHSA-v569-hp3g-36wr"}],"summary":"Rack has quadratic complexity in Rack::Utils.select_best_encoding via wildcard Accept-Encoding header"}