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FKIE_CVE-2026-46727

Vulnerability from fkie_nvd - Published: 2026-05-22 18:16 - Updated: 2026-07-23 16:10
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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
cve@mitre.orghttps://hackerone.com/reports/3607434Permissions Required
cve@mitre.orghttps://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/Vendor Advisory
Impacted products
Vendor Product Version
ruby-lang ruby *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Ruby",
          "vendor": "ruby-lang",
          "versions": [
            {
              "lessThan": "4.0.5",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BA79BA10-3D56-4399-A909-60048906946A",
              "versionEndExcluding": "4.0.5",
              "versionStartIncluding": "4.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-46727",
  "lastModified": "2026-07-23T16:10:00.137",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-46727",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-22T18:41:24.966247Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-22T18:16:22.927",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://hackerone.com/reports/3607434"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.ruby-lang.org/en/news/2026/05/20/getaddrinfo-cve-2026-46727/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    }
  ]
}



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