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       perl5163delta - what is new for perl v5.16.3


       This document describes differences between the 5.16.2 release and the 5.16.3 release.

       If you are upgrading from an earlier release such as 5.16.1, first read perl5162delta,
       which describes differences between 5.16.1 and 5.16.2.

Core Enhancements

       No changes since 5.16.0.


       This release contains one major and a number of minor security fixes.  These latter are
       included mainly to allow the test suite to pass cleanly with the clang compiler's address
       sanitizer facility.

   CVE-2013-1667: memory exhaustion with arbitrary hash keys
       With a carefully crafted set of hash keys (for example arguments on a URL), it is possible
       to cause a hash to consume a large amount of memory and CPU, and thus possibly to achieve
       a Denial-of-Service.

       This problem has been fixed.

   wrap-around with IO on long strings
       Reading or writing strings greater than 2**31 bytes in size could segfault due to integer

       This problem has been fixed.

   memory leak in Encode
       The UTF-8 encoding implementation in Encode.xs had a memory leak which has been fixed.

Incompatible Changes

       There are no changes intentionally incompatible with 5.16.0. If any exist, they are bugs
       and reports are welcome.


       There have been no deprecations since 5.16.0.

Modules and Pragmata

   Updated Modules and Pragmata
       ·   Encode has been upgraded from version 2.44 to version 2.44_01.

       ·   Module::CoreList has been upgraded from version 2.76 to version 2.76_02.

       ·   XS::APItest has been upgraded from version 0.38 to version 0.39.

Known Problems



       Perl 5.16.3 represents approximately 4 months of development since Perl 5.16.2 and
       contains approximately 870 lines of changes across 39 files from 7 authors.

       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 5.16.3:

       Andy Dougherty, Chris 'BinGOs' Williams, Dave Rolsky, David Mitchell, Michael Schroeder,
       Ricardo Signes, Yves Orton.

       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.

       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 articles recently posted to the
       comp.lang.perl.misc newsgroup and 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 please send it to This points to a closed subscription unarchived mailing
       list, which includes all the core committers, who will be able to help assess the impact
       of issues, figure out a resolution, and help co-ordinate the release of patches to
       mitigate or fix the problem across all platforms on which Perl is supported. Please only
       use this address for security issues in the Perl core, not for modules independently
       distributed on CPAN.


       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.