{"action":"Upgrade ruby-concurrent to 1.3.7-1 or later.","affected":[{"fixed":"1.3.7-1","introduced":"0"}],"component":"ruby-concurrent","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1.3.7-1"],"id":"tcs_01M5NSZSK9GK0PFX7BN1552BA1","modified_at":"2026-10-01T03:03:26.598767997Z","published_at":"2026-06-24T17:17:29.550Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-54906","https://security-tracker.debian.org/tracker/CVE-2026-54906"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-54906#Debian:14/ruby-concurrent","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-54906"}],"summary":"concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReadWriteLock#release_write_lock does not verify that the calling thread acquired the write lock. Any thread with ac"}