Vulnerability-Lookup

CVE-2025-15646 (GCVE-0-2025-15646)

Vulnerability from cvelistv5 – Published: 2026-07-01 14:38 – Updated: 2026-07-01 18:09

Title

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

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-843 - Access of Resource Using Incompatible Type (Type Confusion)
CWE-125 - Out-of-bounds Read

Assigner

CPANSec

References

4 references

URL	Tags
https://github.com/bestpractical/HTML-Gumbo/commi…	patch
https://metacpan.org/release/BPS/HTML-Gumbo-0.19/…	release-notes
https://bugs.debian.org/1104789	issue-tracking
http://www.openwall.com/lists/oss-security/2026/07/01/7

Impacted products

1 product

Vendor	Product	Version
BPS	HTML::Gumbo	Affected: 0 , < 0.19 (custom)

Credits

Vincent Lefevre Niko Tyni

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-15646

Vulnerability from fkie_nvd - Published: 2026-07-01 16:16 - Updated: 2026-07-01 19:16

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://bugs.debian.org/1104789
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/07/01/7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "HTML-Gumbo",
          "product": "HTML::Gumbo",
          "programFiles": [
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          ],
          "programRoutines": [
            {
              "name": "walk_tree"
            }
          ],
          "repo": "https://github.com/bestpractical/HTML-Gumbo",
          "vendor": "BPS",
          "versions": [
            {
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              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
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        }
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  ],
  "id": "CVE-2025-15646",
  "lastModified": "2026-07-01T19:16:34.947",
  "metrics": {
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      {
        "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",
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        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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            }
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      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch"
    },
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  "vulnStatus": "Received",
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          "lang": "en",
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        },
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        }
      ],
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      "type": "Secondary"
    }
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}

GHSA-754R-H5MG-R795

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

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

Show details on source website

JSON

To clipboard

{
  "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"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2025-15646 (GCVE-0-2025-15646)

FKIE_CVE-2025-15646

GHSA-754R-H5MG-R795

Tags

Sightings

Nomenclature