Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ruby-Lang | Ruby | >= 4.0.0, < 4.0.5 |
Related Weaknesses (CWE)
References
- https://hackerone.com/reports/3607434Permissions Required
- https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/Vendor Advisory
FAQ
What is CVE-2026-46727?
CVE-2026-46727 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-46727?
CVE-2026-46727 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46727?
Check the references section above for vendor advisories and patch information. Affected products include: Ruby-Lang Ruby.