1PERL5261DELTA(1) Perl Programmers Reference Guide PERL5261DELTA(1)
2
6 perl5261delta - what is new for perl v5.26.1
7
9 This document describes differences between the 5.26.0 release and the
10 5.26.1 release.
11 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
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. [GH #16021]
20 <https://github.com/Perl/perl5/issues/16021>
21 [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 [GH #16025] <https://github.com/Perl/perl5/issues/16025>
27 [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. [GH #16051] <https://github.com/Perl/perl5/issues/16051>
32
34 There are no changes intentionally incompatible with 5.26.0. If any
35 exist, they are bugs, and we request that you submit a report. See
36 "Reporting Bugs" below.
37
39 Updated Modules and Pragmata
40 • base has been upgraded from version 2.25 to 2.26.
41 The effects of dotless @INC on this module have been limited by the
43 introduction of a more refined and accurate solution for removing
44 '.' from @INC while reducing the false positives.
45 • charnames has been upgraded from version 1.44 to 1.45.
47 • Module::CoreList has been upgraded from version 5.20170530 to
49 5.20170922_26.
50
52 Platform-Specific Notes
53 FreeBSD
54 • Building with g++ on FreeBSD-11.0 has been fixed. [GH #15984]
55 <https://github.com/Perl/perl5/issues/15984>
56 Windows
58 • Support for compiling perl on Windows using Microsoft Visual
59 Studio 2017 (containing Visual C++ 14.1) has been added.
60 • Building XS modules with GCC 6 in a 64-bit build of Perl failed
62 due to incorrect mapping of "strtoll" and "strtoull". This has
63 now been fixed. [GH #16074]
64 <https://github.com/Perl/perl5/issues/16074> [cpan #121683]
65 <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
66 #122353]
67 <https://rt.cpan.org/Public/Bug/Display.html?id=122353>
68
70 • Several built-in functions previously had bugs that could cause
71 them to write to the internal stack without allocating room for the
72 item being written. In rare situations, this could have led to a
73 crash. These bugs have now been fixed, and if any similar bugs are
74 introduced in future, they will be detected automatically in
75 debugging builds. [GH #16076]
76 <https://github.com/Perl/perl5/issues/16076>
77 • Using a symbolic ref with postderef syntax as the key in a hash
79 lookup was yielding an assertion failure on debugging builds. [GH
80 #16029] <https://github.com/Perl/perl5/issues/16029>
81 • List assignment ("aassign") could in some rare cases allocate an
83 entry on the mortal stack and leave the entry uninitialized. [GH
84 #16017] <https://github.com/Perl/perl5/issues/16017>
85 • Attempting to apply an attribute to an "our" variable where a
87 function of that name already exists could result in a NULL pointer
88 being supplied where an SV was expected, crashing perl. [perl
89 #131597] <https://rt.perl.org/Public/Bug/Display.html?id=131597>
90 • The code that vivifies a typeglob out of a code ref made some false
92 assumptions that could lead to a crash in cases such as "$::{"A"} =
93 sub {}; \&{"A"}". This has now been fixed. [GH #15937]
94 <https://github.com/Perl/perl5/issues/15937>
95 • "my_atof2" no longer reads beyond the terminating NUL, which
97 previously occurred if the decimal point is immediately before the
98 NUL. [GH #16002] <https://github.com/Perl/perl5/issues/16002>
99 • Occasional "Malformed UTF-8 character" crashes in "s//" on utf8
101 strings have been fixed. [GH #16019]
102 <https://github.com/Perl/perl5/issues/16019>
103 • "perldoc -f s" now finds "s///". [GH #15989]
105 <https://github.com/Perl/perl5/issues/15989>
106 • Some erroneous warnings after utf8 conversion have been fixed. [GH
108 #15958] <https://github.com/Perl/perl5/issues/15958>
109 • The "jmpenv" frame to catch Perl exceptions is set up lazily, and
111 this used to be a bit too lazy. The catcher is now set up earlier,
112 preventing some possible crashes. [GH #11804]
113 <https://github.com/Perl/perl5/issues/11804>
114 • Spurious "Assuming NOT a POSIX class" warnings have been removed.
116 [GH #16001] <https://github.com/Perl/perl5/issues/16001>
117
119 Perl 5.26.1 represents approximately 4 months of development since Perl
120 5.26.0 and contains approximately 8,900 lines of changes across 85
121 files from 23 authors.
122 Excluding auto-generated files, documentation and release tools, there
124 were approximately 990 lines of changes to 38 .pm, .t, .c and .h files.
125 Perl continues to flourish into its third decade thanks to a vibrant
127 community of users and developers. The following people are known to
128 have contributed the improvements that became Perl 5.26.1:
129 Aaron Crane, Andy Dougherty, Aristotle Pagaltzis, Chris 'BinGOs'
131 Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, David Mitchell, E.
132 Choroba, Eric Herman, Father Chrysostomos, Jacques Germishuys, James E
133 Keenan, John SJ Anderson, Karl Williamson, Ken Brown, Lukas Mai,
134 Matthew Horsfall, Ricardo Signes, Sawyer X, Steve Hay, Tony Cook, Yves
135 Orton, Zefram.
136 The list above is almost certainly incomplete as it is automatically
138 generated from version control history. In particular, it does not
139 include the names of the (very much appreciated) contributors who
140 reported issues to the Perl bug tracker.
141 Many of the changes included in this version originated in the CPAN
143 modules included in Perl's core. We're grateful to the entire CPAN
144 community for helping Perl to flourish.
145 For a more complete list of all of Perl's historical contributors,
147 please see the AUTHORS file in the Perl source distribution.
148
150 If you find what you think is a bug, you might check the perl bug
151 database at <https://rt.perl.org/> . There may also be information at
152 <http://www.perl.org/> , the Perl Home Page.
153 If you believe you have an unreported bug, please run the perlbug
155 program included with your release. Be sure to trim your bug down to a
156 tiny but sufficient test case. Your bug report, along with the output
157 of "perl -V", will be sent off to perlbug@perl.org to be analysed by
158 the Perl porting team.
159 If the bug you are reporting has security implications which make it
161 inappropriate to send to a publicly archived mailing list, then see
162 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
163 how to report the issue.
164
166 If you wish to thank the Perl 5 Porters for the work we had done in
167 Perl 5, you can do so by running the "perlthanks" program:
168 perlthanks
170 This will send an email to the Perl 5 Porters list with your show of
172 thanks.
173
175 The Changes file for an explanation of how to view exhaustive details
176 on what changed.
177 The INSTALL file for how to build Perl.
179 The README file for general stuff.
181 The Artistic and Copying files for copyright information.
183perl v5.38.2 2023-11-30 PERL5261DELTA(1)