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.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-a457bf78b4 advisory.

    This package provides the Perl module HTML::Gumbo. Versions before 0.19 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.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-75010c7f44 advisory.

    This package provides the Perl module HTML::Gumbo. Versions before 0.19 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.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-15646)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
326361	Fedora 43 : perl-HTML-Gumbo (2026-a457bf78b4)	Nessus	Fedora Local Security Checks	critical
326355	Fedora 44 : perl-HTML-Gumbo (2026-75010c7f44)	Nessus	Fedora Local Security Checks	critical
319628	Linux Distros Unpatched Vulnerability : CVE-2025-15646	Nessus	Misc.	critical

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CVE-2025-15646

critical

Tenable Plugins

critical

critical

critical