PERL5403DELTA(1perl)

📦
version 5.44.0 · 2 versions
, in arch rolling

💫 perl5403delta — what's new for perl v5.40.3 💫

okay bestie, gather round, because this is the tea on perl5403delta — it's a page from the Perl Programmers Reference Guide, and it's literally just the changelog for perl v5.40.3. no cap. 🫶

📖 NAME 📖

perl5403delta — what is new for perl v5.40.3 ✨

🌸 DESCRIPTION 🌸

So this doc spills the differences between the 5.40.2 release and the 5.40.3 release. that's it, that's the whole thing 💅

If you're upgrading from an earlier release — like, say, 5.40.1 — bestie, please go read perl5402delta first, because that one covers the differences between 5.40.1 and 5.40.2. do it in order, it's giving responsible queen energy 👑

🔒 Security 🔒

🚨 [CVE-2025-40909] Perl threads have a working directory race condition where file operations may target unintended paths 🚨

okay so this one is SERIOUS, listen up 🙈

Perl thread cloning had a working directory race condition where file operations may target unintended paths. like, your file ops could be going to the wrong place entirely. not the vibe. 💀

The fix: Perl 5.40 will no longer chdir to each handle. periodt.

This problem was discovered by Vincent Lefèvre via [GH #23010](https://github.com/Perl/perl5/issues/23010) and assigned [CVE-2025-40909](https://lists.security.metacpan.org/cve-announce/msg/30017499/) by the CPAN Security Group — you can find them at https://security.metacpan.org/ 🛡️

Fixes were provided via [GH #23019](https://github.com/Perl/perl5/pull/23019) and [GH #23361](https://github.com/Perl/perl5/pull/23361) ✨

lowkey a whole team effort and we love that for us 🫶

😬 Incompatible Changes 😬

Good news bestie: there are no changes intentionally incompatible with 5.40.2. 🎀

If any exist? They're bugs, fr fr, and we're literally requesting that you submit a report. See "Reporting Bugs" below. don't be shy, we want the receipts 👀

🧩 Modules and Pragmata 🧩

✨ Updated Modules and Pragmata ✨

  • Module::CoreList has been upgraded from version 5.20250413_40 to 5.20250803_40. glow-up complete 💅

📚 Documentation 📚

🎀 Changes to Existing Documentation 🎀

We have attempted to update the documentation to reflect the changes listed in this document. 🦋

If you find any we have missed (and like, valid, we're only human), open an issue at https://github.com/Perl/perl5/issues. help a bestie out 🙏

🧪 Testing 🧪

Tests were added and changed to reflect the other additions and changes in this release. yes, they wrote tests. yes, they're thorough. we love a verified release ⭐

🫶 Acknowledgements 🫶

Perl 5.40.3 represents approximately 4 months of development since Perl 5.40.2 and contains approximately 3,400 lines of changes across 43 files from 7 authors. 😭 iconic honestly

Excluding auto-generated files, documentation and release tools, there were approximately 1,100 lines of changes to 6 .pm, .t, .c and .h files.

Perl continues to flourish into its fourth decade thanks to a vibrant community of users and developers. 🌈✨ The following people are known to have contributed the improvements that became Perl 5.40.3:

  • Karen Etheridge
  • Leon Timmermans
  • Lukas Mai
  • Philippe Bruhat (BooK)
  • Richard Leach
  • Steve Hay
  • Thibault Duponchelle

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. you know who you are and ily 💖

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 🐛

Found something sus? If you find what you think is a bug, you might check the perl bug database at https://github.com/Perl/perl5/issues. There may also be information at https://www.perl.org/, the Perl Home Page. 🌐

If you believe you have an unreported bug, please open an issue at https://github.com/Perl/perl5/issues. Be sure to trim your bug down to a tiny but sufficient test case — like, the smallest possible repro, please and thank you 🙏

If the bug you are reporting has security implications which make it inappropriate to send to a public issue tracker, then see "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to report the issue. 🔐

do NOT post a security bug publicly, that's the whole point bestie 😭

💌 Give Thanks 💌

If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you can do so by running the perlthanks program:

perlthanks

This will send an email to the Perl 5 Porters list with your show of thanks. go be sweet, it costs nothing and it absolutely slays 💖

👀 SEE ALSO 👀

  • 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.

okay that's the whole page, you're caught up, you're so welcome 💅

this is perl v5.44.0, dated 2026-10-17, and it lives as page PERL5403DELTA(1perl) — mwah, go update your perl, bestie 🌸🦋✨

📦 where this page comes from