/ 
perl-5.40.2
⭐ Starred 2013 / Test2::Tools::Subtest
Security Advisories (5)
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-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-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-2026-13221 (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.

NAME

Test2::Tools::Subtest - Tools for writing subtests

DESCRIPTION

This package exports subs that let you write subtests.

There are two types of subtests, buffered and streamed. Streamed subtests mimic subtests from Test::More in that they render all events as soon as they are produced. Buffered subtests wait until the subtest completes before rendering any results.

The main difference is that streamed subtests are unreadable when combined with concurrency. Buffered subtests look fine with any number of concurrent threads and processes.

SYNOPSIS

BUFFERED

use Test2::Tools::Subtest qw/subtest_buffered/;

subtest_buffered my_test => sub {
    ok(1, "subtest event A");
    ok(1, "subtest event B");
};

This will produce output like this:

ok 1 - my_test {
    ok 1 - subtest event A
    ok 2 - subtest event B
    1..2
}

STREAMED

The default option is 'buffered'. If you want streamed subtests, the way Test::Builder does it, use this:

use Test2::Tools::Subtest qw/subtest_streamed/;

subtest_streamed my_test => sub {
    ok(1, "subtest event A");
    ok(1, "subtest event B");
};

This will produce output like this:

# Subtest: my_test
    ok 1 - subtest event A
    ok 2 - subtest event B
    1..2
ok 1 - Subtest: my_test

IMPORTANT NOTE

You can use bail_out or skip_all in a subtest, but not in a BEGIN block or use statement. This is due to the way flow control works within a BEGIN block. This is not normally an issue, but can happen in rare conditions using eval, or script files as subtests.

EXPORTS

subtest_streamed $name => $sub
subtest_streamed($name, $sub, @args)
subtest_streamed $name => \%params, $sub
subtest_streamed($name, \%params, $sub, @args)

Run subtest coderef, stream events as they happen.

\%params is a hashref with any arguments you wish to pass into hub construction.

subtest_buffered $name => $sub
subtest_buffered($name, $sub, @args)
subtest_buffered $name => \%params, $sub
subtest_buffered($name, \%params, $sub, @args)

Run subtest coderef, render events all at once when subtest is complete.

\%params is a hashref with any arguments you wish to pass into hub construction.

SOURCE

The source code repository for Test2-Suite can be found at https://github.com/Test-More/Test2-Suite/.

MAINTAINERS

Chad Granum <exodist@cpan.org>

AUTHORS

Chad Granum <exodist@cpan.org>

COPYRIGHT

Copyright 2018 Chad Granum <exodist@cpan.org>.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See http://dev.perl.org/licenses/