CPANSA-HTML-Gumbo-2025-15646: HTML-Gumbo vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-07-01T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-07-01T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 9.8 | Severity | |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
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.
Vulnerabilities
CVE-2025-15646
Vulnerability DescriptionHTML::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.
| Weakness | CWE-125 : Out-of-bounds Read |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| HTML-Gumbo less than 0.19 |
|
Fixed
- HTML-Gumbo greater than or equal 0.19
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-HTML-Gumbo-2025-15646 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-html-gumbo-2025-15646.json - https://bugs.debian.org/1104789 external
https://bugs.debian.org/1104789 - https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch external
https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch - https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes external
https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes - http://www.openwall.com/lists/oss-security/2026/07/01/7 external
http://www.openwall.com/lists/oss-security/2026/07/01/7 - CVE-2025-15646 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2025-15646
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Wed Jul 1 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/