FKIE_CVE-2025-15646

Vulnerability from fkie_nvd - Published: 2026-07-01 16:16 - Updated: 2026-09-30 21:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://bugs.debian.org/1104789
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/07/01/7
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "HTML-Gumbo",
          "product": "HTML::Gumbo",
          "programFiles": [
            "lib/HTML/Gumbo.xs"
          ],
          "programRoutines": [
            {
              "name": "walk_tree"
            }
          ],
          "repo": "https://github.com/bestpractical/HTML-Gumbo",
          "vendor": "BPS",
          "versions": [
            {
              "lessThan": "0.19",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion.\n\nSupport for the \u003ctemplate\u003e 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 =\u003e \u0027string\u0027, or with format =\u003e \u0027tree\u0027, on input containing a \u003ctemplate\u003e element serializes the over-read bytes into the returned result, disclosing bounded heap contents. format =\u003e \u0027callback\u0027 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 trav\u00e9s de confusi\u00f3n de tipos.\n\nEl soporte para el elemento \u003ctemplate\u003e se a\u00f1adi\u00f3 a libgumbo 0.10.0 en 2015, pero la funci\u00f3n walk_tree en lib/HTML/Gumbo.xs no se actualiz\u00f3 para soportarlo. El elemento fue tratado como un nodo de texto, donde strlen() lee m\u00e1s all\u00e1 del bloque del heap al que apunta el puntero.\n\nCualquier llamador que ejecute parse() con el formato predeterminado =\u003e \u0027string\u0027, o con formato =\u003e \u0027tree\u0027, en una entrada que contenga un elemento \u003ctemplate\u003e serializa los bytes le\u00eddos en exceso en el resultado devuelto, revelando contenidos acotados del heap. formato =\u003e \u0027callback\u0027 alcanza un croak en el tipo de nodo no manejado y no se ve afectado."
    }
  ],
  "id": "CVE-2025-15646",
  "lastModified": "2026-09-30T21:10:00.190",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-15646",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-01T18:08:40.682429Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-01T16:16:29.657",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "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": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/01/7"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}



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