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Data-MuForm-0.05
⭐ Starred 6 / Data::MuForm::Field::Compound
Security Advisories (1)
CVE-2026-13048 (2026-08-13)

Data::MuForm::Localizer versions through 0.05 for Perl execute Perl from a message catalog header, reached at an arbitrary path because load_lexicon interpolates the language attribute into the catalog filename. load_lexicon builds the catalog path by appending `Messages/$lang.po` to the directory holding Localizer.pm, where $lang is the language attribute, with no check that it names a bare locale tag. A value holding `../` segments walks out of the message directory, so any readable path with a `.po` suffix is loaded. While parsing the catalog, extract_header_msgstr takes the `Plural-Forms:` header, prefixes `$` to the bare words nplurals, plural and n, and passes the rest verbatim into a string that is evaluated: the nplurals form evaluates the header expression immediately, and the plural_code form compiles it into a subroutine whose body runs when a plural message is localized. A header of `nplurals=2; plural=(system('...'),0);` therefore runs that command as the catalog loads. The evaluation inherits strict, so an expression that assigns to an undeclared variable fails to compile, while one built from calls alone does not. An application that sets the language attribute from request data, an Accept-Language header or a locale parameter, and an attacker who can place a file with a `.po` suffix and chosen contents at a readable path, together give code execution as the application user. The message expansion path is not affected: expand_named substitutes only the placeholder names the caller supplies, and _mangle_value returns the value unchanged.

NAME

Data::MuForm::Field::Compound - field consisting of subfields

VERSION

version 0.05

SYNOPSIS

This field class is designed as the base (parent) class for fields with multiple subfields. An example is Data::MuForm::Field::CompoundDateTime.

A compound parent class requires the use of sub-fields prepended with the parent class name plus a dot

has_field 'birthdate' => ( type => 'DateTime' );
has_field 'birthdate.year' => ( type => 'Year' );
has_field 'birthdate.month' => ( type => 'Month' );
has_field 'birthdate.day' => ( type => 'MonthDay');

If all validation is performed in the parent class so that no validation is necessary in the child classes, then the field class 'Nested' may be used.

The array of subfields is available in the 'fields' array in the compound field:

$form->field('birthdate')->fields

Error messages will be available in the field on which the error occurred. You can access 'error_fields' on the form or on Compound fields (and subclasses, like Repeatable).

The process method of this field runs the process methods on the child fields and then builds a hash of these fields values. This hash is available for further processing by "actions" in Data::MuForm::Field and the validate method.

AUTHOR

Gerda Shank

COPYRIGHT AND LICENSE

This software is copyright (c) 2018 by Gerda Shank.

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