/ 
HTML-FormFu-2.07
/ HTML::FormFu::Deflator::Strftime
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::Deflator::Strftime - Strftime deflator

VERSION

version 2.07

SYNOPSIS

$form->deflator( Strftime => 'start_time' )
    ->strftime( '%d/%m/%Y' );

---
elements:
    - type: Text
      inflators:
          - type: DateTime
            parser:
                strptime: "%Y/%m/%d"
      deflator:
          - type: Strftime
            strftime: "%Y/%m/%d"

DESCRIPTION

Strftime deflator for DateTime objects.

When you redisplay a form to the user following an invalid submission, any fields with DateTime inflators will stringify to something like '1970-01-01T00:00:00'. In most cases it makes more sense to use the same format you've asked the user for. This deflator allows you to specify a more suitable and user-friendly format.

This deflator calls DateTime's strftime method. Possible values for the format string are documented at http://search.cpan.org/dist/DateTime/lib/DateTime.pm#strftime_Patterns.

If you set the form's locale (see "locale" in HTML::FormFu) this is set on the DateTime object. Now you can use %x to get the default date or %X for the default time for the object's locale.

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.