CVE-2026-46727

8.1 HIGH

An issue was discovered in Ruby 4 before 4.0.5

Published: 2026-05-22 · Last updated: 2026-05-26

Severity and scoring

CVSS: 8.1 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-362

Affected products

Vendor	Product
ruby-lang	ruby

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-46727
[Other]https://hackerone.com/reports/3607434
[Vendor advisory]https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/

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CVE-2026-42258 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (9.8 CRITICAL)
CVE-2026-42257 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (9.8 CRITICAL)
CVE-2026-42256 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (6.5 MEDIUM)
CVE-2026-42246 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (7.4 HIGH)
CVE-2026-42245 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (7.5 HIGH)

Same CWE

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CVE-2022-26758 — A malicious application may cause unexpected changes in memory shared between processes (7.1 HIGH)
CVE-2026-1220 — Race in V8 in Google Chrome prior to 144.0.7559.99 allowed a remote attacker to potentially exploit type confusion via a crafted HTML page (7.5 HIGH)
CVE-2026-45603 — Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally (7.0 HIGH)