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CVE-2025-6491

Estado: ModificadaMedia (5.9)—

In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.

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).

Tecnologías afectadas (1)

PHP — PHP

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-6491",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-6491",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-07-14T15:59:51.249317Z"
        }
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    ],
    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "security@php.net",
      "affectedData": [
        {
          "vendor": "PHP Group",
          "product": "PHP",
          "versions": [
            {
              "status": "affected",
              "version": "8.1.*",
              "lessThan": "8.1.33",
              "versionType": "semver"
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  "published": "2025-07-13T22:15:23.353",
  "references": [
    {
      "url": "https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00017.html",
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    },
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@php.net",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
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  ],
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    {
      "lang": "en",
      "value": "In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server."
    },
    {
      "lang": "es",
      "value": "En las versiones de PHP 8.1.* anteriores a la 8.1.33, 8.2.* anteriores a la 8.2.29, 8.3.* anteriores a la 8.3.23 y 8.4.* anteriores a la 8.4.10, al analizar datos XML en extensiones SOAP, un prefijo de espacio de nombres XML demasiado grande (>2 GB) puede provocar la desreferencia de puntero nulo. Esto puede provocar fallos y afectar la disponibilidad del servidor de destino."
    }
  ],
  "lastModified": "2026-06-17T10:02:00.527",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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