/ 
HTML-FormFu-2.07
/ HTML::FormFu::Element::ComboBox
Security Advisories (1)
CVE-2026-19873 (2026-08-31)

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.

NAME

HTML::FormFu::Element::ComboBox - Select / Text hybrid

VERSION

version 2.07

SYNOPSIS

---
elements:
  - type: ComboBox
    name: answer
    label: 'Select yes or no, or write an alternative:'
    values:
      - yes
      - no

DESCRIPTION

Creates a multi element containing a Select field and a Text field.

A ComboBox element named foo would result in a Select menu named foo_select and a Text field named foo_text. The names can instead be overridden by the name value in "select" and "text".

If a value is submitted for the Text field, this will be used in preference to any submitted value for the Select menu.

You can access the submitted value by using the ComboBox's name:

my $value = $form->param_value('foo');

METHODS

default

If the value matches one of the Select menu's options, that options will be selected. Otherwise, the Text field will use the value as its default.

options

See "options" in HTML::FormFu::Role::Element::Group for details.

values

See "values" in HTML::FormFu::Role::Element::Group for details.

value_range

See "value_range" in HTML::FormFu::Role::Element::Group for details.

empty_first

See "empty_first" in HTML::FormFu::Role::Element::Group for details.

empty_first_label

See "empty_first_label" in HTML::FormFu::Role::Element::Group for details.

select

Arguments: \%setting

Set values effecting the Select menu. Known keys are:

name

Override the auto-generated name of the select menu.

text

Arguments: \%setting

Set values effecting the Text field. Known keys are:

name

Override the auto-generated name of the select menu.

CAVEATS

Although this element inherits from HTML::FormFu::Element::Block, its behaviour for the methods filter/filters, constraint/constraints, inflator/inflators, validator/validators and transformer/transformers is more like that of a field element, meaning all processors are added directly to the date element, not to its child elements.

This element's get_elements and get_all_elements are inherited from HTML::FormFu::Element::Block, and so have the same behaviour. However, it overrides the get_fields|HTML::FormFu/get_fields method, such that it returns both itself and its child elements.

SEE ALSO

Is a sub-class of, and inherits methods from HTML::FormFu::Element::Multi, HTML::FormFu::Element::Block, HTML::FormFu::Element

HTML::FormFu

AUTHOR

Carl Franks, cfranks@cpan.org

LICENSE

This library is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

Carl Franks <cpan@fireartist.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2018 by Carl Franks.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.