Vulnerability Details CVE-2026-46727
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 36.8%
CVSS Severity
CVSS v3 Score 8.1
References
Products affected by CVE-2026-46727
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cpe:2.3:a:ruby-lang:ruby:4.0.0
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cpe:2.3:a:ruby-lang:ruby:4.0.1
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cpe:2.3:a:ruby-lang:ruby:4.0.2
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cpe:2.3:a:ruby-lang:ruby:4.0.3
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cpe:2.3:a:ruby-lang:ruby:4.0.4