This document describes differences between the 5.16.2 release and the
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.
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 wraparound.
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.
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
o Encode has been upgraded from version 2.44 to version 2.44_01.
o Module::CoreList has been upgraded from version 2.76 to version
o XS::APItest has been upgraded from version 0.38 to version 0.39.
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.
For a more complete list of all of Perl's historical contributors,
please see the AUTHORS file in the Perl source distribution.
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 http://rt.perl.org/perlbug/ . There may also be
information at http://www.perl.org/ , 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 email@example.com 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 firstname.lastname@example.org. 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.
perl v5.22.1 2018-11-19 PERL5163DELTA(1)
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