Vulnerability in Ruby-lang Ruby
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 n…
Vulnerability class: Race Condition
EPSS: 0.002 (36.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Ruby-lang Ruby — versions 4.0.0
Weakness classification (CWE)
References
- cve@mitre.org (Permissions Required)
- cve@mitre.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-46727?
- CVE-2026-46727 is a high-severity vulnerability in Ruby-lang Ruby, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2026-05-22.
- How severe is CVE-2026-46727?
- High severity. CVSS v3 base score is 8.1 out of 10.