/ 
perl-5.27.11
⭐ Starred 2013 / CPAN::Meta::Merge
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-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-2023-47100

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.

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-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.

NAME

CPAN::Meta::Merge - Merging CPAN Meta fragments

VERSION

version 2.150010

SYNOPSIS

my $merger = CPAN::Meta::Merge->new(default_version => "2");
my $meta = $merger->merge($base, @additional);

DESCRIPTION

METHODS

new

This creates a CPAN::Meta::Merge object. It takes one mandatory named argument, version, declaring the version of the meta-spec that must be used for the merge. It can optionally take an extra_mappings argument that allows one to add additional merging functions for specific elements.

The extra_mappings arguments takes a hash ref with the same type of structure as described in CPAN::Meta::Spec, except with its values as one of the defined merge strategies or a code ref to a merging function.

my $merger = CPAN::Meta::Merge->new(
    default_version => '2',
    extra_mappings => {
        'optional_features' => \&custom_merge_function,
        'x_custom' => 'set_addition',
        'x_meta_meta' => {
            name => 'identical',
            tags => 'set_addition',
        }
    }
);

merge(@fragments)

Merge all @fragments together. It will accept both CPAN::Meta objects and (possibly incomplete) hashrefs of metadata.

MERGE STRATEGIES

merge uses various strategies to combine different elements of the CPAN::Meta objects. The following strategies can be used with the extra_mappings argument of new:

identical

The elements must be identical

set_addition

The union of two array refs

[ a, b ] U [ a, c]  = [ a, b, c ]
uniq_map

Key value pairs from the right hash are merged to the left hash. Key collisions are only allowed if their values are the same. This merge function will recurse into nested hash refs following the same merge rules.

improvise

This merge strategy will try to pick the appropriate predefined strategy based on what element type. Array refs will try to use the set_addition strategy, Hash refs will try to use the uniq_map strategy, and everything else will try the identical strategy.

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.