/ 
perl-5.25.2
⭐ Starred 2013 / release_schedule
Security Advisories (14)
CVE-2023-47100

In Perl before 5.38.2, S_parse_uniprop_string in regcomp.c can write to unallocated space because a property name associated with a \p{...} regular expression construct is mishandled. The earliest affected version is 5.30.0.

CVE-2026-8376 (2026-05-25)

Perl versions through 5.43.10 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds. Perl_study_chunk in regcomp_study.c checked the size of the joined substring buffer in characters rather than bytes. For a quantified fixed substring with a large minimum count, the byte length mincount * l could overflow SSize_t, producing an undersized SvGROW allocation; the subsequent copy writes past the end of the buffer. A caller that compiles an attacker-controlled regular expression on a 32-bit perl build triggers a heap buffer overflow at compile time.

CVE-2023-47039 (2023-10-30)

Perl for Windows relies on the system path environment variable to find the shell (cmd.exe). When running an executable which uses Windows Perl interpreter, Perl attempts to find and execute cmd.exe within the operating system. However, due to path search order issues, Perl initially looks for cmd.exe in the current working directory. An attacker with limited privileges can exploit this behavior by placing cmd.exe in locations with weak permissions, such as C:\ProgramData. By doing so, when an administrator attempts to use this executable from these compromised locations, arbitrary code can be executed.

CVE-2025-40909 (2025-05-30)

Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running. This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit. The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

CVE-2026-57432 (2026-07-13)

Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template derived from untrusted input can read heap memory past the buffer and return it to the caller.

CVE-2020-10878 (2020-06-05)

Perl before 5.30.3 has an integer overflow related to mishandling of a "PL_regkind[OP(n)] == NOTHING" situation. A crafted regular expression could lead to malformed bytecode with a possibility of instruction injection.

CVE-2026-13221 (2026-07-13)

Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branches is compiled into a trie in Perl_study_chunk. When such branches are combined into a trie, the delta between the first branch and the shared tail is stored in a 16-bit field. A branch count above 65535 overflows the field, and the trie's match decision table is truncated with no warning or error. A pattern of this shape produces false positive matches (matching strings it should not) and false negative matches (failing to match strings it should). When such a pattern gates an access or filtering decision, the result is wrong.

CVE-2026-4176 (2026-03-29)

Perl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Zlib. Compress::Raw::Zlib is included in the Perl package as a dual-life core module, and is vulnerable to CVE-2026-3381 due to a vendored version of zlib which has several vulnerabilities, including CVE-2026-27171. The bundled Compress::Raw::Zlib was updated to version 2.221 in Perl blead commit c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94.

CVE-2020-12723 (2020-06-05)

regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.

CVE-2020-10543 (2020-06-05)

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow.

CVE-2018-18314 (2018-12-07)

Perl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CVE-2018-18313 (2018-12-07)

Perl before 5.26.3 has a buffer over-read via a crafted regular expression that triggers disclosure of sensitive information from process memory.

CVE-2018-18312 (2018-12-05)

Perl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CVE-2018-18311 (2018-12-07)

Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

NAME

release_schedule - Perl 5 release schedule

STABLE RELEASE SCHEDULE

This schedule lists the projected or historical development and release schedules for the next, current and previous stable versions of Perl. Dates with two or more question marks will only be releases if deemed necessary by the Pumpking.

Perl 5.26

Code freezes (which happen in the 5.25.X series)

2016-12-20  5.25.8          Contentious changes freeze
2017-01-20  5.25.9          User-visible changes freeze
2017-02-20  5.25.10         Full code freeze
2017-04-20  5.26.0          Stable release!

Perl 5.24

2016-05-09  5.24.0 ✓        Ricardo Signes
2016-07-??  5.24.1          ??

Perl 5.22

2015-06-01  5.22.0 ✓        Ricardo Signes
2015-12-13  5.22.1 ✓        Steve Hay
2016-04-29  5.22.2 ✓        Steve Hay
2016-??-??  5.22.3          ??

DEVELOPMENT RELEASE SCHEDULE

This schedule lists the release engineers for at least the next four months of releases of bleadperl. If there are fewer than four months listed as you make a release, it's important that you extend the schedule AND identify the next release engineer.

Before adding a release engineer, you must contact them and they must consent to ship the release.

When shipping a release, you should include the schedule for (at least) the next four releases. If a stable version of Perl is released, you should reset the version numbers to the next blead series.

Perl 5.25

2016-04-08  5.25.0 ✓        Ricardo Signes
2016-05-20  5.25.1 ✓        Sawyer X
2016-06-20  5.25.2          Matthew Horsfall
2016-07-20  5.25.3          Steve Hay
2016-08-20  5.25.4          BinGOs
2016-09-20  5.25.5          Stevan Little
2016-10-20  5.25.6          Sawyer X
2016-11-20  5.25.7          Aaron Crane
2016-12-20  5.25.8          ?
2017-01-20  5.25.9          ?
2017-02-20  5.25.10         Renée Bäcker

(RC0 for 5.26.0 will be released once we think that all the blockers have been addressed. This typically means some time in April or May.)

VICTIMS

The following porters have all consented to do at least one release of bleadperl. If you can't do a release and can't find a substitute amongst this list, mail p5p.

(Please do not add any names to this list without prior consent of the Pumpking.)

Abigail <abigail@abigail.be>
Aristotle Pagaltzis <pagaltzis@gmx.de>
Ask Bjørn Hansen <ask@perl.org>
Chris Williams <bingos@cpan.org>
Dave Cross <dave@perlhacks.com>
Dave Rolsky <autarch@urth.org>
David Golden <dagolden@cpan.org>
Florian Ragwitz <rafl@debian.org>
Jesse Luehrs <doy@cpan.org>
Jesse Vincent <jesse@cpan.org>
Leon Brocard <acme@astray.com>
Matt Trout <mst@shadowcat.co.uk>
Matthew Horsfall <wolfsage@gmail.com>
Max Maischein <corion@cpan.org>
Peter Martini <petercmartini@gmail.com>
Philippe Bruhat <book@cpan.org>
Ricardo Signes <rjbs@cpan.org>
Stevan Little <stevan@cpan.org>
Steve Hay <steve.m.hay@googlemail.com>
Tatsuhiko Miyagawa <miyagawa@bulknews.net>
Tony Cook <tony@develop-help.com>
Yves Orton <demerphq@gmail.com>
Zefram <zefram@fysh.org>
Ævar Arnfjörð Bjarmason <avar@cpan.org>

AUTHOR

Jesse Vincent <jesse@cpan.org>