/ 
HTML-FormFu-2.07
/ HTML::FormFu::Role::Constraint::Others
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::Role::Constraint::Others - Base class for constraints needing others() method

VERSION

version 2.07

METHODS

others

Arguments: \@nested_names

other_siblings

Arguments: $bool

If true, the "others" list will be automatically generated from the nested_name of all fields which are considered siblings of the field the constraint is attached to.

Sibling are found by searching up through the field's parental hierarchy for the first block containing any other field. All fields attached at any depth to this block are considered siblings.

attach_errors_to_base

If true, any error will cause the error message to be associated with the field the constraint is attached to.

Can be use in conjunction with "attach_errors_to_others".

Is ignored if "attach_errors_to" is set.

attach_errors_to_others

If true, any error will cause the error message to be associated with every field named in "others".

Can be use in conjunction with "attach_errors_to_base".

Is ignored if "attach_errors_to" is set.

attach_errors_to

Arguments: \@field_names

Any error will cause the error message to be associated with every field named in "attach_errors_to".

Overrides "attach_errors_to_base" and "attach_errors_to_others".

SEE ALSO

Is a sub-class of, and inherits methods from HTML::FormFu::Constraint

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.