GHSA-754R-H5MG-R795

Vulnerability from github – Published: 2026-07-01 18:31 – Updated: 2026-07-01 21:36
VLAI
Details

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

Support for the 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 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.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-15646"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-01T16:16:29Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-754r-h5mg-r795",
  "modified": "2026-07-01T21:36:15Z",
  "published": "2026-07-01T18:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15646"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch"
    },
    {
      "type": "WEB",
      "url": "https://bugs.debian.org/1104789"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/01/7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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