concurrent-execution-using-shared-resource-with-improper-synchronization-('race-condition')
CVE-2026-46727
Ruby
CVSS Details
CVSS Score
8.1 HIGH
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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.
Disclosure Date
Public Disclosure
May 20, 2026