=encoding utf8

=head1 NAME

perldelta - what is new for perl v5.41.11

=head1 DESCRIPTION

This document describes differences between the 5.41.10 release and the 5.41.11
release.

If you are upgrading from an earlier release such as 5.41.9, first read
L<perl54110delta>, which describes differences between 5.41.9 and 5.41.10.

=head1 Core Enhancements

=head2 Unicode 16.0 supported

Perl now supports Unicode 16.0
L<https://www.unicode.org/versions/Unicode16.0.0/> including the changes
introduced in 15.1 L<https://www.unicode.org/versions/Unicode15.1.0/>.

=head1 Security

=head2 [CVE-2024-56406] Heap buffer overflow vulnerability with tr//

A heap buffer overflow vulnerability was discovered in Perl.

When there are non-ASCII bytes in the left-hand-side of the C<tr> operator,
C<S_do_trans_invmap()> can overflow the destination pointer C<d>.

  $ perl -e '$_ = "\x{FF}" x 1000000; tr/\xFF/\x{100}/;'
  Segmentation fault (core dumped)

It is believed that this vulnerability can enable Denial of Service or
Arbitrary Code Execution attacks on platforms that lack sufficient defenses.

Discovered by: Nathan Mills.

=head1 Modules and Pragmata

=head2 Updated Modules and Pragmata

=over 4

=item *

L<Data::Dumper> has been upgraded from version 2.191 to 2.192.

=item *

L<ExtUtils::MakeMaker> has been upgraded from version 7.72 to 7.74.

=item *

L<Fcntl> has been upgraded from version 1.19 to 1.20.

=item *

L<File::Spec> has been upgraded from version 3.92 to 3.94.

=item *

L<Math::BigInt> has been upgraded from version 2.004001 to 2.005002.

=item *

L<Math::BigInt::FastCalc> has been upgraded from version 0.5019 to 0.5020.

=item *

L<Module::CoreList> has been upgraded from version 5.20250321 to 5.20250420.

=item *

L<Pod::Usage> has been upgraded from version 2.03 to 2.05.

=item *

L<Storable> has been upgraded from version 3.36 to 3.37.

=item *

L<Test::Simple> has been upgraded from version 1.302209 to 1.302210.

=item *

L<Time::HiRes> has been upgraded from version 1.9777 to 1.9778.

=item *

L<Time::Piece> has been upgraded from version 1.35 to 1.36.

=item *

L<Unicode::UCD> has been upgraded from version 0.79 to 0.80.

=item *

L<XS::APItest> has been upgraded from version 1.41 to 1.42.

This fixes [L<GH #16654|https://github.com/Perl/perl5/issues/16654>].

=back

=head1 Documentation

=head2 perlop

=over 4

=item *

Normalized alignment of verbatim sections, fixing how they are displayed by
some Pod viewers that strip indentation.

=back

=head2 Changes to Existing Documentation

We have attempted to update the documentation to reflect the changes
listed in this document. If you find any we have missed, open an issue
at L<https://github.com/Perl/perl5/issues>.

Additionally, the following selected changes have been made:

=head3 L<perlguts>

=over 4

=item *

Additional caveats have been added to the description of C<TARG>.

=back

=head2 Platform-Specific Notes

=over 4

=item MacOS (Darwin)

Collation of strings using locales on MacOS 15 (Darwin 24) and up has
been turned off due to a failed assertion in its libc.

=back

=head1 Selected Bug Fixes

=over 4

=item *

In some cases an C<eval> would not add integer parts to the source
lines saved by the debugger. [L<GH #23151|https://github.com/Perl/perl5/issues/23151>]

=item *

Save debugger lines as C<PVIV> SVs rather than as C<PVMG> SVs as they
don't need magic, aren't blessed and don't need to store a floating
point part.  This should save 24 bytes per stored line for 64-bit
systems, more for C<-Duselongdouble> or C<-Dusequadmath> builds.
Discussed in [L<GH #23171|https://github.com/Perl/perl5/issues/23171>].

=item *

Ensure cloning the save stack for fork emulation doesn't duplicate
freeing the RExC state. [L<GH #23022|https://github.com/Perl/perl5/issues/23022>]

=item *

Smartmatch against a code reference that uses a loop exit such as
C<last> would crash perl. [L<GH #16608|https://github.com/Perl/perl5/issues/16608>]

=item *

Class initializers and C<ADJUST> blocks, per L<perlclass>, that
called C<last> or other loop exits would crash perl.  Same cause as
for [L<GH #16608|https://github.com/Perl/perl5/issues/16608>].

=item *

Prevent a signature parameter of the form C<$ => from leaking an OP at
compile-time. [L<GH #23187|https://github.com/Perl/perl5/issues/23187>]

=back

=head1 Acknowledgements

Perl 5.41.11 represents approximately 4 weeks of development since Perl
5.41.10 and contains approximately 250,000 lines of changes across 460 files
from 22 authors.

Excluding auto-generated files, documentation and release tools, there were
approximately 39,000 lines of changes to 320 .pm, .t, .c and .h files.

Perl continues to flourish into its fourth decade thanks to a vibrant
community of users and developers. The following people are known to have
contributed the improvements that became Perl 5.41.11:

Chad Granum, Chris 'BinGOs' Williams, Dan Book, Daniel Dragan, Graham Knop,
James E Keenan, Karen Etheridge, Karl Williamson, Leon Timmermans, Lukas
Mai, Marek Rouchal, Paul Evans, Peter Eisentraut, Peter John Acklam,
Philippe Bruhat (BooK), Richard Leach, Steve Hay, TAKAI Kousuke, Thibault
Duponchelle, Tony Cook, Unicode Consortium, Vladimír Marek.

The list above is almost certainly incomplete as it is automatically
generated from version control history. In particular, it does not include
the names of the (very much appreciated) contributors who reported issues to
the Perl bug tracker.

Many of the changes included in this version originated in the CPAN modules
included in Perl's core. We're grateful to the entire CPAN community for
helping Perl to flourish.

For a more complete list of all of Perl's historical contributors, please
see the F<AUTHORS> file in the Perl source distribution.

=head1 Reporting Bugs

If you find what you think is a bug, you might check the perl bug database
at L<https://github.com/Perl/perl5/issues>. There may also be information at
L<https://www.perl.org/>, the Perl Home Page.

If you believe you have an unreported bug, please open an issue at
L<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to a
tiny but sufficient test case.

If the bug you are reporting has security implications which make it
inappropriate to send to a public issue tracker, then see
L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
for details of how to report the issue.

=head1 Give Thanks

If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
you can do so by running the C<perlthanks> program:

    perlthanks

This will send an email to the Perl 5 Porters list with your show of thanks.

=head1 SEE ALSO

The F<Changes> file for an explanation of how to view exhaustive details on
what changed.

The F<INSTALL> file for how to build Perl.

The F<README> file for general stuff.

The F<Artistic> and F<Copying> files for copyright information.

=cut