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perl-5.40.2
⭐ Starred 2013 / Test2::Tools::ClassicCompare
Security Advisories (7)
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-2026-4176 (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-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-2026-19487 (2026-08-13)

Perl versions from 5.9.4 before 5.41.9 produce incorrect regular expression match results when a stale failure flag ends the Aho-Corasick prescan early in S_find_byclass. The prescan walks the subject for positions where the full pattern could match, and the engine tries it from the leftmost one recorded. A failing transition sets the failed flag, and a later successful transition does not clear it, so the prescan reads the stale flag as a failure and stops before it can record a candidate that starts earlier. It takes a subject where one candidate is recorded and a later character then forces a fallback through a fail link that succeeds. Example: "ABCDE" =~ m/ABCF|BCDE|C/; # matches C at offset 2, not BCDE "ABCDE" =~ m/ABCF|BCDE|C(G)/; # no match, BCDE missed An alternation like this can miss input it should match, or match it on the wrong branch, so an access or filtering decision made from the result can be wrong.

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-2026-15534 (2026-08-09)

Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each participating WHILEM node, so the bit count is the subject length plus one times the number of nodes. Nothing checks that product for positive overflow of the signed 32-bit count: a 286331153 byte subject matched against a pattern with 15 participating nodes stores the count as 14, leaving a two byte cache. The cache is then indexed from the real match position and node number, so reads go past the end of the allocation, and on failure CACHEsayNO sets a bit past it. A caller that matches an attacker controlled subject of this size against a pattern of this shape can crash the process or corrupt heap memory.

NAME

Test2::Tools::ClassicCompare - Classic (Test::More style) comparison tools.

DESCRIPTION

This provides comparison functions that behave like they did in Test::More, unlike the Test2::Tools::Compare plugin which has modified them.

SYNOPSIS

use Test2::Tools::ClassicCompare qw/is is_deeply isnt like unlike cmp_ok/;

is($got, $expect, "These are the same when stringified");
isnt($got, $unexpected, "These are not the same when stringified");

like($got, qr/.../, "'got' matches the pattern");
unlike($got, qr/.../, "'got' does not match the pattern");

is_deeply($got, $expect, "These structures are same when checked deeply");

cmp_ok($GOT, $OP, $WANT, 'Compare these items using the specified operatr');

EXPORTS

$bool = is($got, $expect)
$bool = is($got, $expect, $name)
$bool = is($got, $expect, $name, @diag)

This does a string comparison of the two arguments. If the two arguments are the same after stringification the test passes. The test will also pass if both arguments are undef.

The test $name is optional.

The test @diag is optional, it is extra diagnostics messages that will be displayed if the test fails. The diagnostics are ignored if the test passes.

It is important to note that this tool considers "1" and "1.0" to not be equal as it uses a string comparison.

See Test2::Tools::Compare if you want an is() function that tries to be smarter for you.

$bool = isnt($got, $dont_expect)
$bool = isnt($got, $dont_expect, $name)
$bool = isnt($got, $dont_expect, $name, @diag)

This is the inverse of is(), it passes when the strings are not the same.

$bool = like($got, $pattern)
$bool = like($got, $pattern, $name)
$bool = like($got, $pattern, $name, @diag)

Check if $got matches the specified pattern. Will fail if it does not match.

The test $name is optional.

The test @diag is optional. It contains extra diagnostics messages that will be displayed if the test fails. The diagnostics are ignored if the test passes.

$bool = unlike($got, $pattern)
$bool = unlike($got, $pattern, $name)
$bool = unlike($got, $pattern, $name, @diag)

This is the inverse of like(). This will fail if $got matches $pattern.

$bool = is_deeply($got, $expect)
$bool = is_deeply($got, $expect, $name)
$bool = is_deeply($got, $expect, $name, @diag)

This does a deep check, comparing the structures in $got with those in $expect. It will recurse into hashrefs, arrayrefs, and scalar refs. All other values will be stringified and compared as strings. It is important to note that this tool considers "1" and "1.0" to not be equal as it uses a string comparison.

This is the same as Test2::Tools::Compare::is().

cmp_ok($got, $op, $expect)
cmp_ok($got, $op, $expect, $name)
cmp_ok($got, $op, $expect, $name, @diag)

Compare $got to $expect using the operator specified in $op. This is effectively an eval "\$got $op \$expect" with some other stuff to make it more sane. This is useful for comparing numbers, overloaded objects, etc.

Overloading Note: Your input is passed as-is to the comparison. If the comparison fails between two overloaded objects, the diagnostics will try to show you the overload form that was used in comparisons. It is possible that the diagnostics will be wrong, though attempts have been made to improve them since Test::More.

Exceptions: If the comparison results in an exception then the test will fail and the exception will be shown.

cmp_ok() has an internal list of operators it supports. If you provide an unsupported operator it will issue a warning. You can add operators to the %Test2::Tools::ClassicCompare::OPS hash, the key should be the operator, and the value should either be 'str' for string comparison operators, 'num' for numeric operators, or any other true value for other operators.

Supported operators:

== (num)
!= (num)
>= (num)
<= (num)
> (num)
< (num)
<=> (num)
eq (str)
ne (str)
gt (str)
lt (str)
ge (str)
le (str)
cmp (str)
!~ (str)
=~ (str)
&&
||
xor
or
and
//
&
|
~~

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/