{"action":"Upgrade concurrent-ruby to 1.3.7 or later.","affected":[{"fixed":"1.3.7","introduced":"0"}],"component":"concurrent-ruby","cve_ids":["CVE-2026-54904"],"ecosystem":"RubyGems","epss":0.00673,"exploited":false,"fixed_versions":["1.3.7"],"ghsa_id":"GHSA-h8w8-99g7-qmvj","id":"tcs_01M5KEKJK8NPNQCQR4NAS1Z0G4","modified_at":"2026-09-10T03:50:49.790653499Z","published_at":"2026-06-19T20:47:35Z","references":["https://osv.dev/vulnerability/GHSA-h8w8-99g7-qmvj","https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-h8w8-99g7-qmvj","https://nvd.nist.gov/vuln/detail/CVE-2026-54904","https://github.com/ruby-concurrency/concurrent-ruby/commit/6e37e0644b83b182971dc540d2e4bee38df61386","https://github.com/ruby-concurrency/concurrent-ruby","https://github.com/ruby-concurrency/concurrent-ruby/releases/tag/v1.3.7","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/concurrent-ruby/CVE-2026-54904.yml","https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54904"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-h8w8-99g7-qmvj","url":"https://osv.dev/vulnerability/GHSA-h8w8-99g7-qmvj"}],"summary":"Concurrent Ruby : `AtomicReference#update` livelocks when the stored value is `Float::NAN`"}