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A race condition vulnerability in Ruby 4 versions before 4.0.5 allows remote attackers to cause a use-after-free in the pthread-based getaddrinfo timeout handler. This can crash the Ruby process when calling Addrinfo.getaddrinfo with a timeout or Socket.tcp with a resolv_timeout. Exploitation requires delaying DNS responses near the user-specified timeout, potentially via a malicious DNS server or resolver. A patch is available in Ruby 4.0.5.

CVE-2026-46727 describes a race condition vulnerability in Ruby 4 versions prior to 4.0.5. The flaw occurs in the pthread-based getaddrinfo timeout handler, where a use-after-free condition can be triggered. This vulnerability can cause the Ruby process to crash when functions such as Addrinfo.getaddrinfo with a timeout or Socket.tcp with a resolv_timeout are called. Exploitation requires an attacker to delay DNS responses close to the user-specified timeout, which could be achieved via a malicious DNS server or resolver. Although memory corruption exploitation is theoretically possible, the primary observed impact is a denial of service via process crash. Ruby 4.0.5 includes a patch that fixes this issue.

Detailed information about An issue was discovered in Ruby 4 before 4.0.5. (CVE-2026-46727) affecting null ruby. Get real-time updates, technical details, and m

An issue was discovered in Ruby 4 before 4.0.5. (CVE-2026-46727) - Live Threat Intelligence - Threat Radar | OffSeq.com

Jruby: An issue was discovered in Ruby 4 before 4.0.5. (CVE-2026-46727)

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