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CVE-2025-15646

Estado: AplazadaCrítica (9.8)—

HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion.

Support for the <template> element was added to libgumbo 0.10.0 in 2015, but the walk_tree function in lib/HTML/Gumbo.xs was not updated to support it. The element was treated as a text-node, where strlen() over-reads the heap block that the pointer addresses.

Any caller that runs parse() with the default format => 'string', or with format => 'tree', on input containing a <template> element serializes the over-read bytes into the returned result, disclosing bounded heap contents. format => 'callback' reaches a croak on the unhandled node type and is unaffected.

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.

Vulnerabilidad remota sin autenticación (AV:N/PR:N/UI:N) en parser HTML expuesto. Desbordamiento de lectura revela contenido de heap; sin evidencia de 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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (2)

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

Html Gumbo — Html GumboAILibgumbo — LibgumboAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-15646",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-15646",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-01T18:08:40.682429Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "repo": "https://github.com/bestpractical/HTML-Gumbo",
          "vendor": "BPS",
          "product": "HTML::Gumbo",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "0.19",
              "versionType": "custom"
            }
          ],
          "packageName": "HTML-Gumbo",
          "programFiles": [
            "lib/HTML/Gumbo.xs"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "walk_tree"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-01T16:16:29.657",
  "references": [
    {
      "url": "https://bugs.debian.org/1104789",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/07/01/7",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion.\n\nSupport for the <template> element was added to libgumbo 0.10.0 in 2015, but the walk_tree function in lib/HTML/Gumbo.xs was not updated to support it. The element was treated as a text-node, where strlen() over-reads the heap block that the pointer addresses.\n\nAny caller that runs parse() with the default format => 'string', or with format => 'tree', on input containing a <template> element serializes the over-read bytes into the returned result, disclosing bounded heap contents. format => 'callback' reaches a croak on the unhandled node type and is unaffected."
    },
    {
      "lang": "es",
      "value": "Las versiones de HTML::Gumbo anteriores a la 0.19 para Perl revelan memoria del heap a través de confusión de tipos.\n\nEl soporte para el elemento <template> se añadió a libgumbo 0.10.0 en 2015, pero la función walk_tree en lib/HTML/Gumbo.xs no se actualizó para soportarlo. El elemento fue tratado como un nodo de texto, donde strlen() lee más allá del bloque del heap al que apunta el puntero.\n\nCualquier llamador que ejecute parse() con el formato predeterminado => 'string', o con formato => 'tree', en una entrada que contenga un elemento <template> serializa los bytes leídos en exceso en el resultado devuelto, revelando contenidos acotados del heap. formato => 'callback' alcanza un croak en el tipo de nodo no manejado y no se ve afectado."
    }
  ],
  "lastModified": "2026-09-30T21:10:00.190",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}