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CVE-2026-46727

Quick assessment

Affected
ruby-lang Ruby
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ruby是松本行弘（Yukihiro Matsumoto）个人开发者的一种跨平台、面向对象的动态类型编程语言。 Ruby 4.0.5之前版本存在竞争条件问题漏洞，该漏洞源于基于pthread的getaddrinfo超时处理程序中的竞争条件导致释放后重用，可能导致远程攻击者通过延迟DNS响应使Ruby进程崩溃。

CVSS 8.1 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
ruby-lang Ruby 4.0.0< 4.0.5 affected
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I. Basic Information for CVE-2026-46727

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby是松本行弘（Yukihiro Matsumoto）个人开发者的一种跨平台、面向对象的动态类型编程语言。 Ruby 4.0.5之前版本存在竞争条件问题漏洞，该漏洞源于基于pthread的getaddrinfo超时处理程序中的竞争条件导致释放后重用，可能导致远程攻击者通过延迟DNS响应使Ruby进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ruby-lang Ruby 4.0.0 ~ 4.0.5 -

II. Public POCs for CVE-2026-46727

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III. Intelligence Information for CVE-2026-46727

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Vendor Advisories for CVE-2026-46727 (1)

IV. Related Vulnerabilities

Same product: Ruby
Same vendor: ruby-lang
Same weakness: CWE-362

V. Comments for CVE-2026-46727

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