« Volver al listado

CVE-2025-48945

Estado: AplazadaAlta (8.2)—

pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.

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.

AV:N/PR:N permite explotación remota sin privilegios (T1190). CWE-416 (use-after-free) causa crash del intérprete Python, negando disponibilidad (T1499.004).

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.

Pycares — PycaresAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-48945",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-48945",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-06-20T20:05:50.595661Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 8.2,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "aio-libs",
          "product": "aiodns",
          "versions": [
            {
              "status": "affected",
              "version": "< 4.9.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-06-20T20:15:33.570",
  "references": [
    {
      "url": "https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/aio-libs/aiodns/releases/tag/v3.5.0",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/saghul/pycares/releases/tag/v4.9.0",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism."
    },
    {
      "lang": "es",
      "value": "Pycares es un módulo de Python que proporciona una interfaz para c-ares. C-ares es una librería de C que realiza solicitudes DNS y resoluciones de nombres de forma asíncrona. En versiones anteriores a la 4.9.0, Pycares era vulnerable a una condición de use-after-free que se produce cuando un objeto de canal se recolecta como basura mientras las consultas DNS aún están pendientes. Esto provoca un error fatal de Python y un fallo del intérprete. Esta vulnerabilidad se ha corregido en Pycares 4.9.0 mediante la implementación de un mecanismo seguro de destrucción de canales."
    }
  ],
  "lastModified": "2026-06-17T09:30:31.813",
  "sourceIdentifier": "security-advisories@github.com"
}