Race Condition Affecting ruby-4.0-dev package, versions <4.0.5-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-RUBY40DEV-16917389
- published28 May 2026
- disclosed22 May 2026
Introduced: 22 May 2026
CVE-2026-46727 (opens in a new tab)How to fix?
Upgrade Minimos:latest ruby-4.0-dev to version 4.0.5-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby-4.0-dev package and not the ruby-4.0-dev package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2026-46727
- https://github.com/advisories/GHSA-jfc8-2xw7-c79m
- https://osv.dev/vulnerability/MINI-hw54-f695-m9w5
- https://osv.dev/vulnerability/CVE-2026-46727
- https://hackerone.com/reports/3607434
- https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/