{ "mode": "man", "parameter": "perl5262delta", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/perl5262delta/1/json", "generated": "2026-06-10T21:11:38Z", "sections": { "NAME": { "content": "perl5262delta - what is new for perl v5.26.2\n", "subsections": [] }, "DESCRIPTION": { "content": "This document describes differences between the 5.26.1 release and the 5.26.2 release.\n\nIf you are upgrading from an earlier release such as 5.26.0, first read perl5261delta, which\ndescribes differences between 5.26.0 and 5.26.1.\n", "subsections": [] }, "Security": { "content": "[CVE-2018-6797] heap-buffer-overflow (WRITE of size 1) in Sregatom (regcomp.c)\nA crafted regular expression could cause a heap buffer write overflow, with control over the\nbytes written. [GH #16185] \n\n[CVE-2018-6798] Heap-buffer-overflow in Perlbytedumpstring (utf8.c)\nMatching a crafted locale dependent regular expression could cause a heap buffer read\noverflow and potentially information disclosure. [GH #16143]\n\n\n[CVE-2018-6913] heap-buffer-overflow in Spackrec\n\"pack()\" could cause a heap buffer write overflow with a large item count. [GH #16098]\n\n\nAssertion failure in Perlcoreswashinit (utf8.c)\nControl characters in a supposed Unicode property name could cause perl to crash. This has\nbeen fixed. [perl #132055] [perl\n#132553] [perl #132658]\n\n", "subsections": [ { "name": "Incompatible Changes", "content": "There are no changes intentionally incompatible with 5.26.1. If any exist, they are bugs,\nand we request that you submit a report. See \"Reporting Bugs\" below.\n" }, { "name": "Modules and Pragmata", "content": "" }, { "name": "Updated Modules and Pragmata", "content": "• Module::CoreList has been upgraded from version 5.2017092226 to 5.2018041426.\n\n• PerlIO::via has been upgraded from version 0.16 to 0.17.\n\n• Term::ReadLine has been upgraded from version 1.16 to 1.17.\n\n• Unicode::UCD has been upgraded from version 0.68 to 0.69.\n" } ] }, "Documentation": { "content": "", "subsections": [ { "name": "Changes to Existing Documentation", "content": "perluniprops\n\n• This has been updated to note that \"\\p{Word}\" now includes code points matching the\n\"\\p{JoinControl}\" property. The change to the property was made in Perl 5.18, but not\ndocumented until now. There are currently only two code points that match this property:\nU+200C (ZERO WIDTH NON-JOINER) and U+200D (ZERO WIDTH JOINER).\n" }, { "name": "Platform Support", "content": "" }, { "name": "Platform-Specific Notes", "content": "Windows\nVisual C++ compiler version detection has been improved to work on non-English language\nsystems. [GH #16235] \n\nWe now set $Config{libpth} correctly for 64-bit builds using Visual C++ versions earlier\nthan 14.1. [GH #16269] \n" }, { "name": "Selected Bug Fixes", "content": "• The \"readpipe()\" built-in function now checks at compile time that it has only one\nparameter expression, and puts it in scalar context, thus ensuring that it doesn't\ncorrupt the stack at runtime. [GH #2793] \n\n• Fixed a use after free bug in \"pplist\" introduced in Perl 5.27.1. [GH #16124]\n\n\n• Parsing a \"sub\" definition could cause a use after free if the \"sub\" keyword was followed\nby whitespace including newlines (and comments). [GH #16097]\n\n\n• The tokenizer now correctly adjusts a parse pointer when skipping whitespace in an \"\n${identifier} \" construct. [perl #131949]\n\n\n• Accesses to \"${^LASTFH}\" no longer assert after using any of a variety of I/O operations\non a non-glob. [GH #15372] \n\n• \"sort\" now performs correct reference counting when aliasing $a and $b, thus avoiding\npremature destruction and leakage of scalars if they are re-aliased during execution of\nthe sort comparator. [GH #11422] \n\n• Some convoluted kinds of regexp no longer cause an arithmetic overflow when compiled.\n[GH #16113] \n\n• Fixed a duplicate symbol failure with -flto -mieee-fp builds. pp.c defined\n\"LIBVERSION\" which -lieee already defines. [GH #16086]\n\n\n• A NULL pointer dereference in the \"Sregmatch()\" function has been fixed. [perl #132017]\n\n\n• Failures while compiling code within other constructs, such as with string interpolation\nand the right part of \"s///e\" now cause compilation to abort earlier.\n\nPreviously compilation could continue in order to report other errors, but the failed\nsub-parse could leave partly parsed constructs on the parser shift-reduce stack,\nconfusing the parser, leading to perl crashes. [GH #14739]\n\n" } ] }, "Acknowledgements": { "content": "Perl 5.26.2 represents approximately 7 months of development since Perl 5.26.1 and contains\napproximately 3,300 lines of changes across 82 files from 17 authors.\n\nExcluding auto-generated files, documentation and release tools, there were approximately\n1,800 lines of changes to 36 .pm, .t, .c and .h files.\n\nPerl continues to flourish into its third decade thanks to a vibrant community of users and\ndevelopers. The following people are known to have contributed the improvements that became\nPerl 5.26.2:\n\nAaron Crane, Abigail, Chris 'BinGOs' Williams, H.Merijn Brand, James E Keenan, Jarkko\nHietaniemi, John SJ Anderson, Karen Etheridge, Karl Williamson, Lukas Mai, Renee Baecker,\nSawyer X, Steve Hay, Todd Rinaldo, Tony Cook, Yves Orton, Zefram.\n\nThe list above is almost certainly incomplete as it is automatically generated from version\ncontrol history. In particular, it does not include the names of the (very much appreciated)\ncontributors who reported issues to the Perl bug tracker.\n\nMany of the changes included in this version originated in the CPAN modules included in\nPerl's core. We're grateful to the entire CPAN community for helping Perl to flourish.\n\nFor a more complete list of all of Perl's historical contributors, please see the AUTHORS\nfile in the Perl source distribution.\n", "subsections": [ { "name": "Reporting Bugs", "content": "If you find what you think is a bug, you might check the perl bug database at\n . There may also be information at , the Perl\nHome Page.\n\nIf you believe you have an unreported bug, please run the perlbug program included with your\nrelease. Be sure to trim your bug down to a tiny but sufficient test case. Your bug report,\nalong with the output of \"perl -V\", will be sent off to perlbug@perl.org to be analysed by\nthe Perl porting team.\n\nIf the bug you are reporting has security implications which make it inappropriate to send to\na publicly archived mailing list, then see \"SECURITY VULNERABILITY CONTACT INFORMATION\" in\nperlsec for details of how to report the issue.\n" }, { "name": "Give Thanks", "content": "If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you can do so by\nrunning the \"perlthanks\" program:\n\nperlthanks\n\nThis will send an email to the Perl 5 Porters list with your show of thanks.\n" } ] }, "SEE ALSO": { "content": "The Changes file for an explanation of how to view exhaustive details on what changed.\n\nThe INSTALL file for how to build Perl.\n\nThe README file for general stuff.\n\nThe Artistic and Copying files for copyright information.\n\n\n\nperl v5.34.0 2025-07-25 PERL5262DELTA(1)", "subsections": [] } }, "summary": "perl5262delta - what is new for perl v5.26.2", "flags": [], "examples": [], "see_also": [], "tldr": { "source": "not_found", "examples": [] } }