{"action":"Upgrade concurrent-ruby to 1.3.7 or later.","affected":[{"fixed":"1.3.7","introduced":"0"}],"component":"concurrent-ruby","cve_ids":["CVE-2026-54906"],"ecosystem":"RubyGems","epss":0.0016,"exploited":false,"fixed_versions":["1.3.7"],"ghsa_id":"GHSA-6wx8-w4f5-wwcr","id":"tcs_01M5KEHE1VWG06WNDPT13BR65E","modified_at":"2026-09-10T03:50:48.681965743Z","published_at":"2026-06-19T20:47:41Z","references":["https://osv.dev/vulnerability/GHSA-6wx8-w4f5-wwcr","https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-6wx8-w4f5-wwcr","https://github.com/ruby-concurrency/concurrent-ruby"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GHSA-6wx8-w4f5-wwcr","url":"https://osv.dev/vulnerability/GHSA-6wx8-w4f5-wwcr"},{"source":"nvd","source_id":"CVE-2026-54906","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54906"}],"summary":"Concurrent Ruby: ReadWriteLock allows wrong-thread write release and stray read-release counter corruption"}