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Source   Latest Release: perl-5.26.0-RC2


perl5255delta - what is new for perl v5.25.5


This document describes differences between the 5.25.4 release and the 5.25.5 release.

If you are upgrading from an earlier release such as 5.25.3, first read perl5254delta, which describes differences between 5.25.3 and 5.25.4.

Security ^

"Escaped" colons and relative paths in PATH

On Unix systems, Perl treats any relative paths in the PATH environment variable as tainted when starting a new process. Previously, it was allowing a backslash to escape a colon (unlike the OS), consequently allowing relative paths to be considered safe if the PATH was set to something like /\:.. The check has been fixed to treat . as tainted in that example.

Modules and Pragmata ^

Updated Modules and Pragmata

Documentation ^

Changes to Existing Documentation


Testing ^

Platform Support ^

Platform-Specific Notes

  • The path separator for the PERL5LIB and PERLLIB environment entries is now a colon (:) when running under a Unix shell. There is no change when running under DCL (it's still |).
  • Remove some VMS-specific hacks from showlex.t. These were added 15 years ago, and are no longer necessary for any VMS version now supported.
  • Tweaks for Win32 VC vs GCC detection makefile code. This fixes issue that CCHOME depends on CCTYPE, which in auto detect mode is set after CCHOME, so CCHOME uses the uninit CCTYPE var. Also fix else vs .ELSE in

Internal Changes ^

Selected Bug Fixes ^

Obituary ^

Jon Portnoy (AVENJ), a prolific Perl author and admired Gentoo community member, has passed away on August 10, 2016. He will be remembered and missed by all those with which he came in contact and enriched with his intellect, wit, and spirit.

Acknowledgements ^

Perl 5.25.5 represents approximately 4 weeks of development since Perl 5.25.4 and contains approximately 67,000 lines of changes across 230 files from 25 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 62,000 lines of changes to 160 .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 5.25.5:

Aaron Crane, Aristotle Pagaltzis, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins, Daniel Dragan, Dave Cross, David Mitchell, E. Choroba, Father Chrysostomos, James E Keenan, Jerry D. Hedden, Karl Williamson, Lukas Mai, Ricardo Signes, Rick Delaney, Sawyer X, Stevan Little, Steve Hay, Sullivan Beck, Theo Buehler, Tony Cook, Yaroslav Kuzmin, 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.

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 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to report the issue.


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.

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