Ruby 4.0.5 has been released with a security fix for CVE-2026-46727, a use-after-free vulnerability in the pthread-based getaddrinfo timeout handler, and a build system regression fix introduced in Ruby 4.0.4 under C locale. The release schedule continues with Ruby 4.0.6 planned for July, 4.0.7 for September, and 4.0.8 for November.
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