Vulnerability-Lookup

UBUNTU-CVE-2025-15646 (CVE-2025-15646)

Vulnerability from osv_ubuntu – Published: 2026-07-01 16:16 – Updated: 2026-07-09 15:10 – Source website

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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-15646	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-15646	REPORT
	https://github.com/ruz/HTML-Gumbo/issues/6	REPORT
	https://github.com/bestpractical/html-gumbo/commi…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-gumbo-perl",
            "binary_version": "0.17-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libhtml-gumbo-perl",
        "purl": "pkg:deb/ubuntu/libhtml-gumbo-perl@0.17-1build1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-gumbo-perl",
            "binary_version": "0.18-2build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libhtml-gumbo-perl",
        "purl": "pkg:deb/ubuntu/libhtml-gumbo-perl@0.18-2build2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18-2build1",
        "0.18-2build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-gumbo-perl",
            "binary_version": "0.18-2build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libhtml-gumbo-perl",
        "purl": "pkg:deb/ubuntu/libhtml-gumbo-perl@0.18-2build4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18-2build3",
        "0.18-2build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libhtml-gumbo-perl",
            "binary_version": "0.18-3build5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libhtml-gumbo-perl",
        "purl": "pkg:deb/ubuntu/libhtml-gumbo-perl@0.18-3build5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18-3build1",
        "0.18-3build2",
        "0.18-3build3",
        "0.18-3build4",
        "0.18-3build5"
      ]
    }
  ],
  "aliases": [],
  "details": "HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion. Support 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. Any 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": "UBUNTU-CVE-2025-15646",
  "modified": "2026-07-09T15:10:16Z",
  "published": "2026-07-01T16:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-15646"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-15646"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ruz/HTML-Gumbo/issues/6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bestpractical/html-gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-15646"
  ]
}

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 18:08 UTC

CWE

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

Assigner

CPANSec redhat root

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

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-01T17:36:44.275Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/01/7"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-15646",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T18:08:40.682429Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-01T18:09:08.371Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Vincent Lefevre"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Niko Tyni"
        }
      ],
      "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-843",
              "description": "CWE-843 Access of Resource Using Incompatible Type (Type Confusion)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T14:38:03.727Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://bugs.debian.org/1104789"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to HTML-Gumbo 0.19 or later, which adds GUMBO_NODE_TEMPLATE to the container node types handled by walk_tree."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2015-04-30T00:00:00.000Z",
          "value": "Gumbo 0.10.0 released with support for the \u003ctemplate\u003e element."
        },
        {
          "lang": "en",
          "time": "2025-05-06T00:00:00.000Z",
          "value": "Reported to the Debian bug tracker (#1104789)."
        },
        {
          "lang": "en",
          "time": "2025-05-17T00:00:00.000Z",
          "value": "Fix committed upstream."
        },
        {
          "lang": "en",
          "time": "2026-05-21T00:00:00.000Z",
          "value": "Version 0.19 released with fix."
        }
      ],
      "title": "HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2025-15646",
    "datePublished": "2026-07-01T14:38:03.727Z",
    "dateReserved": "2026-05-22T10:47:01.107Z",
    "dateUpdated": "2026-07-01T18:09:08.371Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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UBUNTU-CVE-2025-15646 (CVE-2025-15646)

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

Tags

Sightings

Nomenclature

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