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 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 v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://hackerone.com/reports/3607434	Permissions Required
https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-22 18:16

Updated : 2026-07-23 16:10

NVD link : CVE-2026-46727

Mitre link : CVE-2026-46727

CVE.ORG link : CVE-2026-46727

JSON object : View

Products Affected

ruby-lang

ruby

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

{"id": "CVE-2026-46727", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46727", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-22T18:41:24.966247Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}]}, "affected": [{"source": "cve@mitre.org", "affectedData": [{"vendor": "ruby-lang", "product": "Ruby", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.0.5", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-05-22T18:16:22.927", "references": [{"url": "https://hackerone.com/reports/3607434", "tags": ["Permissions Required"], "source": "cve@mitre.org"}, {"url": "https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se descubri\u00f3 un problema en Ruby 4 antes de 4.0.5. Una condici\u00f3n de carrera que conduce a un uso despu\u00e9s de liberaci\u00f3n en el gestor de tiempo de espera de getaddrinfo basado en pthread (rb_getaddrinfo en ext/socket/raddrinfo.c) permite a un atacante remoto que puede retrasar las respuestas DNS cerca del tiempo de espera especificado por el usuario bloquear un proceso de Ruby que llama a Addrinfo.getaddrinfo(..., timeout:) o Socket.tcp(..., resolv_timeout:). La explotaci\u00f3n basada en corrupci\u00f3n de memoria es te\u00f3ricamente posible. El ataque podr\u00eda, por ejemplo, llevarse a cabo a trav\u00e9s de un servidor DNS autoritativo manipulado o un resolvedor recursivo."}], "lastModified": "2026-07-23T16:10:00.137", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BA79BA10-3D56-4399-A909-60048906946A", "versionEndExcluding": "4.0.5", "versionStartIncluding": "4.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}