1PERL5261DELTA(1)       Perl Programmers Reference Guide       PERL5261DELTA(1)
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NAME

6       perl5261delta - what is new for perl v5.26.1
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DESCRIPTION

9       This document describes differences between the 5.26.0 release and the
10       5.26.1 release.
11
12       If you are upgrading from an earlier release such as 5.24.0, first read
13       perl5260delta, which describes differences between 5.24.0 and 5.26.0.
14

Security

16   [CVE-2017-12837] Heap buffer overflow in regular expression compiler
17       Compiling certain regular expression patterns with the case-insensitive
18       modifier could cause a heap buffer overflow and crash perl.  This has
19       now been fixed.  [perl #131582]
20       <https://rt.perl.org/Public/Bug/Display.html?id=131582>
21
22   [CVE-2017-12883] Buffer over-read in regular expression parser
23       For certain types of syntax error in a regular expression pattern, the
24       error message could either contain the contents of a random, possibly
25       large, chunk of memory, or could crash perl.  This has now been fixed.
26       [perl #131598] <https://rt.perl.org/Public/Bug/Display.html?id=131598>
27
28   [CVE-2017-12814] $ENV{$key} stack buffer overflow on Windows
29       A possible stack buffer overflow in the %ENV code on Windows has been
30       fixed by removing the buffer completely since it was superfluous
31       anyway.  [perl #131665]
32       <https://rt.perl.org/Public/Bug/Display.html?id=131665>
33

Incompatible Changes

35       There are no changes intentionally incompatible with 5.26.0.  If any
36       exist, they are bugs, and we request that you submit a report.  See
37       "Reporting Bugs" below.
38

Modules and Pragmata

40   Updated Modules and Pragmata
41       ·   base has been upgraded from version 2.25 to 2.26.
42
43           The effects of dotless @INC on this module have been limited by the
44           introduction of a more refined and accurate solution for removing
45           '.' from @INC while reducing the false positives.
46
47       ·   charnames has been upgraded from version 1.44 to 1.45.
48
49       ·   Module::CoreList has been upgraded from version 5.20170530 to
50           5.20170922_26.
51

Platform Support

53   Platform-Specific Notes
54       FreeBSD
55           ·   Building with g++ on FreeBSD-11.0 has been fixed.  [perl
56               #131337]
57               <https://rt.perl.org/Public/Bug/Display.html?id=131337>
58
59       Windows
60           ·   Support for compiling perl on Windows using Microsoft Visual
61               Studio 2017 (containing Visual C++ 14.1) has been added.
62
63           ·   Building XS modules with GCC 6 in a 64-bit build of Perl failed
64               due to incorrect mapping of "strtoll" and "strtoull".  This has
65               now been fixed.  [perl #131726]
66               <https://rt.perl.org/Public/Bug/Display.html?id=131726> [cpan
67               #121683]
68               <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
69               #122353]
70               <https://rt.cpan.org/Public/Bug/Display.html?id=122353>
71

Selected Bug Fixes

73       ·   Several built-in functions previously had bugs that could cause
74           them to write to the internal stack without allocating room for the
75           item being written.  In rare situations, this could have led to a
76           crash.  These bugs have now been fixed, and if any similar bugs are
77           introduced in future, they will be detected automatically in
78           debugging builds.  [perl #131732]
79           <https://rt.perl.org/Public/Bug/Display.html?id=131732>
80
81       ·   Using a symbolic ref with postderef syntax as the key in a hash
82           lookup was yielding an assertion failure on debugging builds.
83           [perl #131627]
84           <https://rt.perl.org/Public/Bug/Display.html?id=131627>
85
86       ·   List assignment ("aassign") could in some rare cases allocate an
87           entry on the mortal stack and leave the entry uninitialized.  [perl
88           #131570] <https://rt.perl.org/Public/Bug/Display.html?id=131570>
89
90       ·   Attempting to apply an attribute to an "our" variable where a
91           function of that name already exists could result in a NULL pointer
92           being supplied where an SV was expected, crashing perl.  [perl
93           #131597] <https://rt.perl.org/Public/Bug/Display.html?id=131597>
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95       ·   The code that vivifies a typeglob out of a code ref made some false
96           assumptions that could lead to a crash in cases such as $::{"A"} =
97           sub {}; \&{"A"}.  This has now been fixed.  [perl #131085]
98           <https://rt.perl.org/Public/Bug/Display.html?id=131085>
99
100       ·   "my_atof2" no longer reads beyond the terminating NUL, which
101           previously occurred if the decimal point is immediately before the
102           NUL.  [perl #131526]
103           <https://rt.perl.org/Public/Bug/Display.html?id=131526>
104
105       ·   Occasional "Malformed UTF-8 character" crashes in "s//" on utf8
106           strings have been fixed.  [perl #131575]
107           <https://rt.perl.org/Public/Bug/Display.html?id=131575>
108
109       ·   "perldoc -f s" now finds "s///".  [perl #131371]
110           <https://rt.perl.org/Public/Bug/Display.html?id=131371>
111
112       ·   Some erroneous warnings after utf8 conversion have been fixed.
113           [perl #131190]
114           <https://rt.perl.org/Public/Bug/Display.html?id=131190>
115
116       ·   The "jmpenv" frame to catch Perl exceptions is set up lazily, and
117           this used to be a bit too lazy.  The catcher is now set up earlier,
118           preventing some possible crashes.  [perl #105930]
119           <https://rt.perl.org/Public/Bug/Display.html?id=105930>
120
121       ·   Spurious "Assuming NOT a POSIX class" warnings have been removed.
122           [perl #131522]
123           <https://rt.perl.org/Public/Bug/Display.html?id=131522>
124

Acknowledgements

126       Perl 5.26.1 represents approximately 4 months of development since Perl
127       5.26.0 and contains approximately 8,900 lines of changes across 85
128       files from 23 authors.
129
130       Excluding auto-generated files, documentation and release tools, there
131       were approximately 990 lines of changes to 38 .pm, .t, .c and .h files.
132
133       Perl continues to flourish into its third decade thanks to a vibrant
134       community of users and developers.  The following people are known to
135       have contributed the improvements that became Perl 5.26.1:
136
137       Aaron Crane, Andy Dougherty, Aristotle Pagaltzis, Chris 'BinGOs'
138       Williams, Craig A. Berry, Dagfinn Ilmari Mannsaaker, David Mitchell, E.
139       Choroba, Eric Herman, Father Chrysostomos, Jacques Germishuys, James E
140       Keenan, John SJ Anderson, Karl Williamson, Ken Brown, Lukas Mai,
141       Matthew Horsfall, Ricardo Signes, Sawyer X, Steve Hay, Tony Cook, Yves
142       Orton, Zefram.
143
144       The list above is almost certainly incomplete as it is automatically
145       generated from version control history.  In particular, it does not
146       include the names of the (very much appreciated) contributors who
147       reported issues to the Perl bug tracker.
148
149       Many of the changes included in this version originated in the CPAN
150       modules included in Perl's core.  We're grateful to the entire CPAN
151       community for helping Perl to flourish.
152
153       For a more complete list of all of Perl's historical contributors,
154       please see the AUTHORS file in the Perl source distribution.
155

Reporting Bugs

157       If you find what you think is a bug, you might check the perl bug
158       database at <https://rt.perl.org/> .  There may also be information at
159       <http://www.perl.org/> , the Perl Home Page.
160
161       If you believe you have an unreported bug, please run the perlbug
162       program included with your release.  Be sure to trim your bug down to a
163       tiny but sufficient test case.  Your bug report, along with the output
164       of "perl -V", will be sent off to perlbug@perl.org to be analysed by
165       the Perl porting team.
166
167       If the bug you are reporting has security implications which make it
168       inappropriate to send to a publicly archived mailing list, then see
169       "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
170       how to report the issue.
171

Give Thanks

173       If you wish to thank the Perl 5 Porters for the work we had done in
174       Perl 5, you can do so by running the "perlthanks" program:
175
176           perlthanks
177
178       This will send an email to the Perl 5 Porters list with your show of
179       thanks.
180

SEE ALSO

182       The Changes file for an explanation of how to view exhaustive details
183       on what changed.
184
185       The INSTALL file for how to build Perl.
186
187       The README file for general stuff.
188
189       The Artistic and Copying files for copyright information.
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193perl v5.26.3                      2018-03-23                  PERL5261DELTA(1)
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