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Data-MuForm-0.05
⭐ Starred 6 / Data::MuForm::Types
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::Types - Type::Tiny types

VERSION

version 0.05

SYNOPSIS

These types are provided by Type::Tiny. These types must not be quoted when they are used:

has 'posint' => ( is => 'rw', isa => PositiveInt);
has_field 'email' => ( apply => [ Email ] );

To import these types into your forms, you must either specify (':all') or list the types you want to use:

use Data::MuForm::Types (':all');

or:

use Data::MuForm::Types ('Email', 'PositiveInt');

DESCRIPTION

Type Constraints

These types check the value and issue an error message.

Email

Uses Email::Valid

State

Checks that the state is in a list of two uppercase letters.

Zip
IPAddress

Must be a valid IPv4 address.

NoSpaces

No spaces in string allowed.

WordChars

Must be made up of letters, digits, and underscores.

NotAllDigits

Might be useful for passwords.

Printable

Must not contain non-printable characters.

SingleWord

Contains a single word.

Type Coercions

These types will transform the value without an error message;

Collapse

Replaces multiple spaces with a single space

Upper

Makes the string all upper case

Lower

Makes the string all lower case

Trim

Trims the string of starting and ending spaces

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.