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PERL5261DELTA(1pm)     Perl Programmers Reference Guide     PERL5261DELTA(1pm)


       perl5261delta - what is new for perl v5.26.1


       This document describes differences between the 5.26.0 release and the
       5.26.1 release.

       If you are upgrading from an earlier release such as 5.24.0, first read
       perl5260delta, which describes differences between 5.24.0 and 5.26.0.


   [CVE-2017-12837] Heap buffer overflow in regular expression compiler
       Compiling certain regular expression patterns with the case-insensitive
       modifier could cause a heap buffer overflow and crash perl.  This has
       now been fixed.  [GH #16021]

   [CVE-2017-12883] Buffer over-read in regular expression parser
       For certain types of syntax error in a regular expression pattern, the
       error message could either contain the contents of a random, possibly
       large, chunk of memory, or could crash perl.  This has now been fixed.
       [GH #16025] <>

   [CVE-2017-12814] $ENV{$key} stack buffer overflow on Windows
       A possible stack buffer overflow in the %ENV code on Windows has been
       fixed by removing the buffer completely since it was superfluous
       anyway.  [GH #16051] <>

Incompatible Changes

       There are no changes intentionally incompatible with 5.26.0.  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   base has been upgraded from version 2.25 to 2.26.

           The effects of dotless @INC on this module have been limited by the
           introduction of a more refined and accurate solution for removing
           '.' from @INC while reducing the false positives.

       o   charnames has been upgraded from version 1.44 to 1.45.

       o   Module::CoreList has been upgraded from version 5.20170530 to

Platform Support

   Platform-Specific Notes
           o   Building with g++ on FreeBSD-11.0 has been fixed.  [GH #15984]

           o   Support for compiling perl on Windows using Microsoft Visual
               Studio 2017 (containing Visual C++ 14.1) has been added.

           o   Building XS modules with GCC 6 in a 64-bit build of Perl failed
               due to incorrect mapping of "strtoll" and "strtoull".  This has
               now been fixed.  [GH #16074]
               <> [cpan #121683]
               <> [cpan

Selected Bug Fixes

       o   Several built-in functions previously had bugs that could cause
           them to write to the internal stack without allocating room for the
           item being written.  In rare situations, this could have led to a
           crash.  These bugs have now been fixed, and if any similar bugs are
           introduced in future, they will be detected automatically in
           debugging builds.  [GH #16076]

       o   Using a symbolic ref with postderef syntax as the key in a hash
           lookup was yielding an assertion failure on debugging builds.  [GH
           #16029] <>

       o   List assignment ("aassign") could in some rare cases allocate an
           entry on the mortal stack and leave the entry uninitialized.  [GH
           #16017] <>

       o   Attempting to apply an attribute to an "our" variable where a
           function of that name already exists could result in a NULL pointer
           being supplied where an SV was expected, crashing perl.  [perl
           #131597] <>

       o   The code that vivifies a typeglob out of a code ref made some false
           assumptions that could lead to a crash in cases such as $::{"A"} =
           sub {}; \&{"A"}.  This has now been fixed.  [GH #15937]

       o   "my_atof2" no longer reads beyond the terminating NUL, which
           previously occurred if the decimal point is immediately before the
           NUL.  [GH #16002] <>

       o   Occasional "Malformed UTF-8 character" crashes in "s//" on utf8
           strings have been fixed.  [GH #16019]

       o   "perldoc -f s" now finds "s///".  [GH #15989]

       o   Some erroneous warnings after utf8 conversion have been fixed.  [GH
           #15958] <>

       o   The "jmpenv" frame to catch Perl exceptions is set up lazily, and
           this used to be a bit too lazy.  The catcher is now set up earlier,
           preventing some possible crashes.  [GH #11804]

       o   Spurious "Assuming NOT a POSIX class" warnings have been removed.
           [GH #16001] <>


       Perl 5.26.1 represents approximately 4 months of development since Perl
       5.26.0 and contains approximately 8,900 lines of changes across 85
       files from 23 authors.

       Excluding auto-generated files, documentation and release tools, there
       were approximately 990 lines of changes to 38 .pm, .t, .c and .h files.

       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 5.26.1:

       Aaron Crane, Andy Dougherty, Aristotle Pagaltzis, Chris 'BinGOs'
       Williams, Craig A. Berry, Dagfinn Ilmari Mannsaaker, David Mitchell, E.
       Choroba, Eric Herman, Father Chrysostomos, Jacques Germishuys, James E
       Keenan, John SJ Anderson, Karl Williamson, Ken Brown, Lukas Mai,
       Matthew Horsfall, Ricardo Signes, Sawyer X, Steve Hay, 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                PERL5261DELTA(1pm)

perl 5.34.0 - Generated Fri Feb 25 06:15:35 CST 2022
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