HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from the query string in Repeatable elements. When a Repeatable element has counter_name set, its process method reads the repeat count from the named query string parameter, checks only that it is a positive integer, and passes it to repeat, which deep-clones the element's child subtree once per iteration. Nothing caps the value, and no attribute lets an application impose a limit. The count is read on every request, before the form decides whether it was submitted, so a plain GET reaches the clone loop with no credentials, no session and no request body. Nesting multiplies: a Repeatable inside a Repeatable takes a counter at each level, so an outer and an inner value of 100 build 10,000 clones. Once the form is submitted, each cloned field's constraints scan the whole element tree in _find_field_value, so cost grows faster than linearly with the count. A single request exhausts memory and CPU. The latest release on CPAN is 2.07, from 2018. Version 2.08 exists only in the git repository.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-18537daffc advisory.

    HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from     the query string in Repeatable elements.
    In this package, a max_counter attribute has been added to Repeatable elements that caps the client-     supplied repeat count from the query string. Default is 100, inherited from a new form-level     repeatable_max_counter attribute.

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 45 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-94d32d2e8e advisory.

    HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from     the query string in Repeatable elements.
    In this package, a max_counter attribute has been added to Repeatable elements that caps the client-     supplied repeat count from the query string. Default is 100, inherited from a new form-level     repeatable_max_counter attribute.

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 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-219b6aef6c advisory.

    HTML::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from     the query string in Repeatable elements.
    In this package, a max_counter attribute has been added to Repeatable elements that caps the client-     supplied repeat count from the query string. Default is 100, inherited from a new form-level     repeatable_max_counter attribute.

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::FormFu versions through 2.08 for Perl allow resource exhaustion via an unbounded repeat count from     the query string in Repeatable elements. When a Repeatable element has counter_name set, its process     method reads the repeat count from the named query string parameter, checks only that it is a positive     integer, and passes it to repeat, which deep-clones the element's child subtree once per iteration.
    Nothing caps the value, and no attribute lets an application impose a limit. The count is read on every     request, before the form decides whether it was submitted, so a plain GET reaches the clone loop with no     credentials, no session and no request body. Nesting multiplies: a Repeatable inside a Repeatable takes a     counter at each level, so an outer and an inner value of 100 build 10,000 clones. Once the form is     submitted, each cloned field's constraints scan the whole element tree in _find_field_value, so cost grows     faster than linearly with the count. A single request exhausts memory and CPU. The latest release on CPAN     is 2.07, from 2018. Version 2.08 exists only in the git repository. (CVE-2026-19873)

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

ID	Name	Product	Family	Type	Severity
351109	Fedora 44 : perl-HTML-FormFu (2026-18537daffc)	Nessus	Fedora Local Security Checks	Local	high
350997	Fedora 45 : perl-HTML-FormFu (2026-94d32d2e8e)	Nessus	Fedora Local Security Checks	Local	high
350968	Fedora 43 : perl-HTML-FormFu (2026-219b6aef6c)	Nessus	Fedora Local Security Checks	Local	high
341680	Linux Distros Unpatched Vulnerability : CVE-2026-19873	Nessus	Misc.	Local	high

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CVE-2026-19873

high

Tenable Plugins

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high

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