/ 
perl-5.27.11
⭐ Starred 2013 / CPAN::Meta::Converter
Security Advisories (7)
CVE-2020-12723 (2020-06-05)

regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.

CVE-2020-10878 (2020-06-05)

Perl before 5.30.3 has an integer overflow related to mishandling of a "PL_regkind[OP(n)] == NOTHING" situation. A crafted regular expression could lead to malformed bytecode with a possibility of instruction injection.

CVE-2025-40909 (2025-05-30)

Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running. This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit. The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

CVE-2020-10543 (2020-06-05)

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow.

CVE-2018-6798 (2018-04-17)

An issue was discovered in Perl 5.22 through 5.26. Matching a crafted locale dependent regular expression can cause a heap-based buffer over-read and potentially information disclosure.

CVE-2023-47039 (2023-10-30)

Perl for Windows relies on the system path environment variable to find the shell (cmd.exe). When running an executable which uses Windows Perl interpreter, Perl attempts to find and execute cmd.exe within the operating system. However, due to path search order issues, Perl initially looks for cmd.exe in the current working directory. An attacker with limited privileges can exploit this behavior by placing cmd.exe in locations with weak permissions, such as C:\ProgramData. By doing so, when an administrator attempts to use this executable from these compromised locations, arbitrary code can be executed.

CVE-2023-47100

In Perl before 5.38.2, S_parse_uniprop_string in regcomp.c can write to unallocated space because a property name associated with a \p{...} regular expression construct is mishandled. The earliest affected version is 5.30.0.

NAME

CPAN::Meta::Converter - Convert CPAN distribution metadata structures

VERSION

version 2.150010

SYNOPSIS

my $struct = decode_json_file('META.json');

my $cmc = CPAN::Meta::Converter->new( $struct );

my $new_struct = $cmc->convert( version => "2" );

DESCRIPTION

This module converts CPAN Meta structures from one form to another. The primary use is to convert older structures to the most modern version of the specification, but other transformations may be implemented in the future as needed. (E.g. stripping all custom fields or stripping all optional fields.)

METHODS

new

my $cmc = CPAN::Meta::Converter->new( $struct );

The constructor should be passed a valid metadata structure but invalid structures are accepted. If no meta-spec version is provided, version 1.0 will be assumed.

Optionally, you can provide a default_version argument after $struct:

my $cmc = CPAN::Meta::Converter->new( $struct, default_version => "1.4" );

This is only needed when converting a metadata fragment that does not include a meta-spec field.

convert

my $new_struct = $cmc->convert( version => "2" );

Returns a new hash reference with the metadata converted to a different form. convert will die if any conversion/standardization still results in an invalid structure.

Valid parameters include:

  • version -- Indicates the desired specification version (e.g. "1.0", "1.1" ... "1.4", "2"). Defaults to the latest version of the CPAN Meta Spec.

Conversion proceeds through each version in turn. For example, a version 1.2 structure might be converted to 1.3 then 1.4 then finally to version 2. The conversion process attempts to clean-up simple errors and standardize data. For example, if author is given as a scalar, it will converted to an array reference containing the item. (Converting a structure to its own version will also clean-up and standardize.)

When data are cleaned and standardized, missing or invalid fields will be replaced with sensible defaults when possible. This may be lossy or imprecise. For example, some badly structured META.yml files on CPAN have prerequisite modules listed as both keys and values:

requires => { 'Foo::Bar' => 'Bam::Baz' }

These would be split and each converted to a prerequisite with a minimum version of zero.

When some mandatory fields are missing or invalid, the conversion will attempt to provide a sensible default or will fill them with a value of 'unknown'. For example a missing or unrecognized license field will result in a license field of 'unknown'. Fields that may get an 'unknown' include:

  • abstract

  • author

  • license

upgrade_fragment

my $new_struct = $cmc->upgrade_fragment;

Returns a new hash reference with the metadata converted to the latest version of the CPAN Meta Spec. No validation is done on the result -- you must validate after merging fragments into a complete metadata document.

Available since version 2.141170.

BUGS

Please report any bugs or feature using the CPAN Request Tracker. Bugs can be submitted through the web interface at http://rt.cpan.org/Dist/Display.html?Queue=CPAN-Meta

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

AUTHORS

  • David Golden <dagolden@cpan.org>

  • Ricardo Signes <rjbs@cpan.org>

  • Adam Kennedy <adamk@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by David Golden, Ricardo Signes, Adam Kennedy and Contributors.

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