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PERL5262DELTA(1pm)     Perl Programmers Reference Guide     PERL5262DELTA(1pm)


       perl5262delta - what is new for perl v5.26.2


       This document describes differences between the 5.26.1 release and the
       5.26.2 release.

       If you are upgrading from an earlier release such as 5.26.0, first read
       perl5261delta, which describes differences between 5.26.0 and 5.26.1.


   [CVE-2018-6797] heap-buffer-overflow (WRITE of size 1) in S_regatom
       A crafted regular expression could cause a heap buffer write overflow,
       with control over the bytes written.  [GH #16185]

   [CVE-2018-6798] Heap-buffer-overflow in Perl__byte_dump_string (utf8.c)
       Matching a crafted locale dependent regular expression could cause a
       heap buffer read overflow and potentially information disclosure.  [GH
       #16143] <>

   [CVE-2018-6913] heap-buffer-overflow in S_pack_rec
       "pack()" could cause a heap buffer write overflow with a large item
       count.  [GH #16098] <>

   Assertion failure in Perl__core_swash_init (utf8.c)
       Control characters in a supposed Unicode property name could cause perl
       to crash.  This has been fixed.  [perl #132055]
       <> [perl #132553]
       <> [perl #132658]

Incompatible Changes

       There are no changes intentionally incompatible with 5.26.1.  If any
       exist, they are bugs, and we request that you submit a report.  See
       "Reporting Bugs" below.

Modules and Pragmata

   Updated Modules and Pragmata
       o   Module::CoreList has been upgraded from version 5.20170922_26 to

       o   PerlIO::via has been upgraded from version 0.16 to 0.17.

       o   Term::ReadLine has been upgraded from version 1.16 to 1.17.

       o   Unicode::UCD has been upgraded from version 0.68 to 0.69.


   Changes to Existing Documentation

       o   This has been updated to note that "\p{Word}" now includes code
           points matching the "\p{Join_Control}" property.  The change to the
           property was made in Perl 5.18, but not documented until now.
           There are currently only two code points that match this property:

Platform Support

   Platform-Specific Notes
           Visual C++ compiler version detection has been improved to work on
           non-English language systems.  [GH #16235]

           We now set $Config{libpth} correctly for 64-bit builds using Visual
           C++ versions earlier than 14.1.  [GH #16269]

Selected Bug Fixes

       o   The "readpipe()" built-in function now checks at compile time that
           it has only one parameter expression, and puts it in scalar
           context, thus ensuring that it doesn't corrupt the stack at
           runtime.  [GH #2793] <>

       o   Fixed a use after free bug in "pp_list" introduced in Perl 5.27.1.
           [GH #16124] <>

       o   Parsing a "sub" definition could cause a use after free if the
           "sub" keyword was followed by whitespace including newlines (and
           comments).  [GH #16097]

       o   The tokenizer now correctly adjusts a parse pointer when skipping
           whitespace in an " ${identifier} " construct.  [perl #131949]

       o   Accesses to "${^LAST_FH}" no longer assert after using any of a
           variety of I/O operations on a non-glob.  [GH #15372]

       o   "sort" now performs correct reference counting when aliasing $a and
           $b, thus avoiding premature destruction and leakage of scalars if
           they are re-aliased during execution of the sort comparator.  [GH
           #11422] <>

       o   Some convoluted kinds of regexp no longer cause an arithmetic
           overflow when compiled.  [GH #16113]

       o   Fixed a duplicate symbol failure with -flto -mieee-fp builds.  pp.c
           defined "_LIB_VERSION" which -lieee already defines.  [GH #16086]

       o   A NULL pointer dereference in the "S_regmatch()" function has been
           fixed.  [perl #132017]

       o   Failures while compiling code within other constructs, such as with
           string interpolation and the right part of "s///e" now cause
           compilation to abort earlier.

           Previously compilation could continue in order to report other
           errors, but the failed sub-parse could leave partly parsed
           constructs on the parser shift-reduce stack, confusing the parser,
           leading to perl crashes.  [GH #14739]


       Perl 5.26.2 represents approximately 7 months of development since Perl
       5.26.1 and contains approximately 3,300 lines of changes across 82
       files from 17 authors.

       Excluding auto-generated files, documentation and release tools, there
       were approximately 1,800 lines of changes to 36 .pm, .t, .c and .h

       Perl continues to flourish into its third decade thanks to a vibrant
       community of users and developers.  The following people are known to
       have contributed the improvements that became Perl 5.26.2:

       Aaron Crane, Abigail, Chris 'BinGOs' Williams, H.Merijn Brand, James E
       Keenan, Jarkko Hietaniemi, John SJ Anderson, Karen Etheridge, Karl
       Williamson, Lukas Mai, Renee Baecker, Sawyer X, Steve Hay, Todd
       Rinaldo, Tony Cook, Yves Orton, Zefram.

       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 AUTHORS file in the Perl source distribution.

Reporting Bugs

       If you find what you think is a bug, you might check the perl bug
       database at <> .  There may also be information at
       <> , the Perl Home Page.

       If you believe you have an unreported bug, please run the perlbug
       program included with your release.  Be sure to trim your bug down to a
       tiny but sufficient test case.  Your bug report, along with the output
       of "perl -V", will be sent off to to be analysed by
       the Perl porting team.

       If the bug you are reporting has security implications which make it
       inappropriate to send to a publicly archived mailing list, then see
       how to report the issue.

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 "perlthanks" program:


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


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

       The INSTALL file for how to build Perl.

       The README file for general stuff.

       The Artistic and Copying files for copyright information.

perl v5.34.0                      2021-05-04                PERL5262DELTA(1pm)

perl 5.34.0 - Generated Fri Feb 25 06:15:58 CST 2022
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