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CVE-2026-2291

Estado: Pendiente de análisisAlta (7.3)—

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

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.

Servicio DNS remoto sin autenticación (AV:N, PR:N); desbordamiento de buffer en extract_name() permite inyectar entradas falsas en caché DNS (suplantación de origen) o causar DoS (caída del servicio).

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 TrafficNetwork SegmentationLimit Access to Resource Over NetworkVulnerability ScanningUser TrainingRestrict File and Directory Permissions

Tecnologías afectadas (1)

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

Dnsmasq — DnsmasqAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-2291",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-2291",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-13T12:38:54.623336Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.3,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cret@cert.org",
      "affectedData": [
        {
          "vendor": "dnsmasq",
          "product": "dnsmasq",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "2.92rel2",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-11T18:16:31.363",
  "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"
    },
    {
      "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://www.suse.com/security/cve/CVE-2026-2291.html",
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/07/20/14",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "descriptions": [
    {
      "lang": "en",
      "value": "dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS."
    }
  ],
  "lastModified": "2026-07-20T21:16:46.783",
  "sourceIdentifier": "cret@cert.org"
}