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Ruby Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition) Vulnerability - CVE-2026-46727 - Vulnerability Database
Ruby

Ruby Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition) Vulnerability - CVE-2026-46727

High
Reference: CVE-2026-46727
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-46727
Title: Ruby Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition) Vulnerability
Overview:

An issue was discovered in Ruby 4 before 4.0.5. A race condition leading to a use-after-free in the pthread-based getaddrinfo timeout handler (rb_getaddrinfo in ext/socket/raddrinfo.c) allows a remote attacker who can delay DNS responses near the user-specified timeout to crash a Ruby process that calls Addrinfo.getaddrinfo(... timeout:) or Socket.tcp(... resolv_timeout:). Memory-corruption-based exploitation is theoretically possible. The attack could for example be carried out through a crafted authoritative DNS server or recursive resolver.