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CVE-2026-5172

Estado: Pendiente de análisisAlta (7.3)—

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector CVSS AV:N/AC:L/PR:N sin UI requiere red sin privilegios (T1190). Buffer overflow en DNS permite DoS por crash (T1499.004) y lectura de memoria (T1005). La pista sugiere T1059 pero el texto describe crash y out-of-bounds read, no ejecución de código.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Dnsmasq — DnsmasqAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-5172",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5172",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-13T12:47:52.137124Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
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        "cvssData": {
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          "version": "3.1",
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          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Secondary",
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        "cvssData": {
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "confidentialityImpact": "NONE"
        },
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  },
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      "source": "cret@cert.org",
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          "vendor": "Red Hat",
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          "versions": [
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              "status": "unaffected",
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              "lessThan": "*",
              "versionType": "rpm"
            }
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          "packageName": "dnsmasq",
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          "defaultStatus": "affected"
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          "vendor": "Red Hat",
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          "defaultStatus": "affected"
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        {
          "cpes": [
            "cpe:/a:redhat:openshift:4"
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          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "packageName": "openshift/ose-rhel-coreos-9",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
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  ],
  "published": "2026-05-11T18:16:41.920",
  "references": [
    {
      "url": "https://github.com/NixOS/nixpkgs/pull/519082",
      "source": "cret@cert.org"
    },
    {
      "url": "https://github.com/NixOS/nixpkgs/pull/519093",
      "source": "cret@cert.org"
    },
    {
      "url": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2",
      "source": "cret@cert.org"
    },
    {
      "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html",
      "source": "cret@cert.org"
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    {
      "url": "https://thekelleys.org.uk/dnsmasq/CVE/",
      "source": "cret@cert.org"
    },
    {
      "url": "https://www.kb.cert.org/vuls/id/471747",
      "source": "cret@cert.org"
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:19158",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    },
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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    {
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    },
    {
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end."
    }
  ],
  "lastModified": "2026-08-24T13:19:12.803",
  "sourceIdentifier": "cret@cert.org"
}