{"action":"Upgrade concurrent-ruby to 1.3.7 or later.","affected":[{"fixed":"1.3.7","introduced":"0"}],"component":"concurrent-ruby","cve_ids":["CVE-2026-54905"],"ecosystem":"RubyGems","epss":0.00153,"exploited":false,"fixed_versions":["1.3.7"],"ghsa_id":"GHSA-wv3x-4vxv-whpp","id":"tcs_01M5KEP1AAEPTJEC09B9QEMKQH","modified_at":"2026-09-10T03:50:50.897491142Z","published_at":"2026-06-19T20:47:38Z","references":["https://osv.dev/vulnerability/GHSA-wv3x-4vxv-whpp","https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-wv3x-4vxv-whpp","https://nvd.nist.gov/vuln/detail/CVE-2026-54905","https://github.com/ruby-concurrency/concurrent-ruby","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/concurrent-ruby/CVE-2026-54905.yml","https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54905"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"GHSA-wv3x-4vxv-whpp","url":"https://osv.dev/vulnerability/GHSA-wv3x-4vxv-whpp"}],"summary":"Concurrent Ruby: `ReentrantReadWriteLock` read-count overflow grants a write lock without exclusivity"}