High severity8.1NVD Advisory· Published May 22, 2026· Updated May 26, 2026
CVE-2026-46727
CVE-2026-46727
Description
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.
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Affected products
4- osv-coords3 versions
>= 4.0.0, < 4.0.5+ 2 more
- (no CPE)range: >= 4.0.0, < 4.0.5
- (no CPE)range: >= 4.0.0, < 4.0.5
- (no CPE)range: < 4.0.5-1.1
Patches
Vulnerability mechanics
References
2- www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/nvdVendor Advisory
- hackerone.com/reports/3607434nvdPermissions Required
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