CVE-2025-15646

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Source
https://cve.org/CVERecord?id=CVE-2025-15646
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-15646.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-15646
Downstream
Published
2026-07-01T14:38:03.727Z
Modified
2026-07-08T07:12:24.569428525Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/15xxx/CVE-2025-15646.json",
    "cna_assigner": "CPANSec",
    "cwe_ids": [
        "CWE-125",
        "CWE-843"
    ]
}
References

Affected packages

Git / github.com/bestpractical/html-gumbo

Affected ranges

Type
GIT
Repo
https://github.com/bestpractical/html-gumbo
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e245984553cdbe3a85f2e250d976c1ff8abad921
Fixed
15c0598909d4a64f47ef0a1abc5051f4e113c186
Database specific 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.19"
        }
    ]
}

Affected versions

0.*
0.11
0.12
0.16
0.17
0.18

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-15646.json"