BPS HTML::Gumbo up to 0.18 on Perl lib/HTML/Gumbo.xs strlen type confusion

Summaryinfo

A vulnerability was found in BPS HTML::Gumbo up to 0.18 on Perl. It has been rated as critical. This impacts the function strlen in the library lib/HTML/Gumbo.xs. This manipulation causes type confusion. This vulnerability is handled as CVE-2025-15646. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in BPS HTML::Gumbo up to 0.18 on Perl. Affected by this vulnerability is the function strlen in the library lib/HTML/Gumbo.xs. The manipulation with an unknown input leads to a type confusion vulnerability. The CWE definition for the vulnerability is CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released by Vincent Lefevre as 15c0598909d4a64f47ef0a1abc5051f4e113c186. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-15646 since 05/22/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.19 eliminates this vulnerability. Applying the patch 15c0598909d4a64f47ef0a1abc5051f4e113c186 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• BPS

Name

• HTML::Gumbo

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
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• 🔒

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