phpman > man > perl5283delta(1)

PERL5283DELTA(1)                  Perl Programmers Reference Guide                  PERL5283DELTA(1)



NAME
       perl5283delta - what is new for perl v5.28.3

DESCRIPTION
       This document describes differences between the 5.28.2 release and the 5.28.3 release.

       If you are upgrading from an earlier release such as 5.28.1, first read perl5282delta, which
       describes differences between 5.28.1 and 5.28.2.

Security
   [CVE-2020-10543] Buffer overflow caused by a crafted regular expression
       A signed "size_t" integer overflow in the storage space calculations for nested regular
       expression quantifiers could cause a heap buffer overflow in Perl's regular expression
       compiler that overwrites memory allocated after the regular expression storage space with
       attacker supplied data.

       The target system needs a sufficient amount of memory to allocate partial expansions of the
       nested quantifiers prior to the overflow occurring.  This requirement is unlikely to be met
       on 64-bit systems.

       Discovered by: ManhND of The Tarantula Team, VinCSS (a member of Vingroup).

   [CVE-2020-10878] Integer overflow via malformed bytecode produced by a crafted regular expression
       Integer overflows in the calculation of offsets between instructions for the regular
       expression engine could cause corruption of the intermediate language state of a compiled
       regular expression.  An attacker could abuse this behaviour to insert instructions into the
       compiled form of a Perl regular expression.

       Discovered by: Hugo van der Sanden and Slaven Rezic.

   [CVE-2020-12723] Buffer overflow caused by a crafted regular expression
       Recursive calls to "S_study_chunk()" by Perl's regular expression compiler to optimize the
       intermediate language representation of a regular expression could cause corruption of the
       intermediate language state of a compiled regular expression.

       Discovered by: Sergey Aleynikov.

   Additional Note
       An application written in Perl would only be vulnerable to any of the above flaws if it
       evaluates regular expressions supplied by the attacker.  Evaluating regular expressions in
       this fashion is known to be dangerous since the regular expression engine does not protect
       against denial of service attacks in this usage scenario.

Incompatible Changes
       There are no changes intentionally incompatible with Perl 5.28.2.  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
       •   Module::CoreList has been upgraded from version 5.20190419 to 5.20200601_28.

Testing
       Tests were added and changed to reflect the other additions and changes in this release.

Acknowledgements
       Perl 5.28.3 represents approximately 13 months of development since Perl 5.28.2 and contains
       approximately 3,100 lines of changes across 48 files from 16 authors.

       Excluding auto-generated files, documentation and release tools, there were approximately
       1,700 lines of changes to 9 .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 5.28.3:

       Chris 'BinGOs' Williams, Dan Book, Hugo van der Sanden, James E Keenan, John Lightsey, Karen
       Etheridge, Karl Williamson, Matthew Horsfall, Max Maischein, Nicolas R., Renee Baecker,
       Sawyer X, Steve Hay, Tom Hukins, Tony Cook, Zak B.  Elep.

       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
       <https://github.com/Perl/perl5/issues>.  There may also be information at
       <https://www.perl.org/>, the Perl Home Page.

       If you believe you have an unreported bug, please open an issue at
       <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 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for
       details of 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:

           perlthanks

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

SEE ALSO
       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                                 2025-07-25                             PERL5283DELTA(1)