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


       perldelta - what is new for perl v5.34.3


       This document describes differences between the 5.34.1 release and the
       5.34.3 release.  Please note: This document ignores Perl 5.34.2, a
       broken release which existed for a couple of days only.

       If you are upgrading from an earlier release such as 5.34.0, first read
       perl5341delta, which describes differences between 5.34.0 and 5.34.1.


       This release fixes the following security issues.

   CVE-2023-47038 - Write past buffer end via illegal user-defined Unicode
       This vulnerability was reported directly to the Perl security team by
       Nathan Mills "".

       A crafted regular expression when compiled by perl 5.30.0 through
       5.38.0 can cause a one-byte attacker controlled buffer overflow in a
       heap allocated buffer.

   CVE-2023-47039 - Perl for Windows binary hijacking vulnerability
       This vulnerability was reported to the Intel Product Security Incident
       Response Team (PSIRT) by GitHub user ycdxsb
       <>. PSIRT then
       reported it to the Perl security team.

       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


       Perl 5.34.3 represents approximately 1 month of development since Perl
       5.34.1 and contains approximately 3,700 lines of changes across 40
       files from 4 authors.

       Excluding auto-generated files, documentation and release tools, there
       were approximately 2,800 lines of changes to 9 .pm, .t, .c and .h

       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 5.34.3:

       Karl Williamson, Paul Evans, Steve Hay, Tony Cook.

       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 open an issue at
       <>.  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:


       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 v5.34.3                      2023-11-28                    PERLDELTA(1pm)

perl 5.34.3 - Generated Wed Dec 6 05:59:25 CST 2023
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