perl-5.36.0

Security Advisories (5)

CVE-2023-47038 (2023-10-30)

A crafted regular expression when compiled by perl 5.30.0 through 5.38.0 can cause a one attacker controlled byte buffer overflow in a heap allocated buffer

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-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-2024-56406 (2025-04-13)

A heap buffer overflow vulnerability was discovered in Perl. Release branches 5.34, 5.36, 5.38 and 5.40 are affected, including development versions from 5.33.1 through 5.41.10. When there are non-ASCII bytes in the left-hand-side of the `tr` operator, `S_do_trans_invmap` can overflow the destination pointer `d`. $ perl -e '$_ = "\x{FF}" x 1000000; tr/\xFF/\x{100}/;' Segmentation fault (core dumped) It is believed that this vulnerability can enable Denial of Service and possibly Code Execution attacks on platforms that lack sufficient defenses.

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

Gee, Brain, what do you want to do tonight? EOPOD

is($results, <<'EOHTML', "simple paragraph"); Gee, Brain, what do you want to do tonight?

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

B: Now, Pinky, if by any chance you are captured during this mission, remember you are Gunther Heindriksen from Appenzell. You moved to Grindelwald to drive the cog train to Murren. Can you repeat that?

P: Mmmm, no, Brain, dont think I can. EOPOD

is($results, <<'EOHTML', "multiple paragraphs"); B: Now, Pinky, if by any chance you are captured during this mission, remember you are Gunther Heindriksen from Appenzell. You moved to Grindelwald to drive the cog train to Murren. Can you repeat that?

P: Mmmm, no, Brain, dont think I can.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

P: Gee, Brain, what do you want to do tonight?
B: The same thing we do every night, Pinky. Try to take over the world!

EOPOD

is($results, <<'EOHTML', "simple bulleted list"); <ul>

<li>P: Gee, Brain, what do you want to do tonight?

</li> <li>B: The same thing we do every night, Pinky. Try to take over the world!

</li> </ul>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

P: Gee, Brain, what do you want to do tonight?
B: The same thing we do every night, Pinky. Try to take over the world!
- Take over world
- Do laundry

EOPOD

is($results, <<'EOHTML', "nested bulleted list"); <ul>

<li>P: Gee, Brain, what do you want to do tonight?

</li> <li>B: The same thing we do every night, Pinky. Try to take over the world!

<ul>

<li>Take over world

</li> <li>Do laundry

</li> </ul>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

P: Gee, Brain, what do you want to do tonight?
B: The same thing we do every night, Pinky. Try to take over the world!

EOPOD

is($results, <<'EOHTML', "numbered list"); <ol>

<li>P: Gee, Brain, what do you want to do tonight?

</li> <li>B: The same thing we do every night, Pinky. Try to take over the world!

</li> </ol>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

P: Gee, Brain, what do you want to do tonight?
B: The same thing we do every night, Pinky. Try to take over the world!
1. Take over world
2. Do laundry

EOPOD

is($results, <<'EOHTML', "nested numbered list"); <ol>

<li>P: Gee, Brain, what do you want to do tonight?

</li> <li>B: The same thing we do every night, Pinky. Try to take over the world!

<ol>

<li>Take over world

</li> <li>Do laundry

</li> </ol>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

Pinky: Gee, Brain, what do you want to do tonight?
Brain: The same thing we do every night, Pinky. Try to take over the world!

EOPOD

is($results, <<'EOHTML', "list with text headings"); <dl>

<dt>Pinky</dt> <dd>

Gee, Brain, what do you want to do tonight?

</dd> <dt>Brain</dt> <dd>

The same thing we do every night, Pinky. Try to take over the world!

</dd> </dl>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

Pinky

Gee, Brain, what do you want to do tonight?
Brain

The same thing we do every night, Pinky. Try to take over the world!

EOPOD

is($results, <<'EOHTML', "list with bullet and text headings"); <ul>

<li>Pinky

Gee, Brain, what do you want to do tonight?

</li> <li>Brain

The same thing we do every night, Pinky. Try to take over the world!

</li> </ul>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

Brain <brain@binkyandthebrain.com>
Pinky <pinky@binkyandthebrain.com>

EOPOD

is($results, <<'EOHTML', "bulleted author list"); <ul>

<li>Brain <brain@binkyandthebrain.com>

</li> <li>Pinky <pinky@binkyandthebrain.com>

</li> </ul>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

Pinky

World Domination

Brain

EOPOD

is($results, <<'EOHTML', 'nested lists'); <dl>

<dt>Pinky</dt> <dd>

<dl>

<dt>World Domination</dt> <dd>

</dd> </dl>

</dd> <dt>Brain</dt> <dd>

</dd> </dl>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =over

Pinky

On the list:

World Domination: Fight the good fight
Go to Europe: (Steve Martin joke)

Brain

Not so much

EOPOD

is($results, <<'EOHTML', 'multiparagraph nested lists'); <dl>

<dt>Pinky</dt> <dd>

On the list:

<dl>

<dt>World Domination</dt> <dd>

Fight the good fight

</dd> <dt>Go to Europe</dt> <dd>

(Steve Martin joke)

</dd> </dl>

</dd> <dt>Brain</dt> <dd>

Not so much

</dd> </dl>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

1 + 1 = 2;
2 + 2 = 4;

EOPOD

is($results, <<'EOHTML', "code block"); <pre><code> 1 + 1 = 2; 2 + 2 = 4;</code></pre>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a functionname.

This code is important to <me>!

EOPOD is($results, <<"EOHTML", "code entity in a paragraph"); A plain paragraph with a <code>functionname</code>.

<code>This code is important to <me>!</code>

EOHTML

initialize($parser, $results); $parser->html_header("<html>\n<body>"); $parser->html_footer("</body>\n</html>"); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with body tags turned on. EOPOD is($results, <<"EOHTML", "adding html body tags"); <html> <body>

A plain paragraph with body tags turned on.

</body> </html>

EOHTML

initialize($parser, $results); $parser->html_css('style.css'); $parser->html_header(undef); $parser->html_footer(undef); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with body tags and css tags turned on. EOPOD like($results, qr/<link rel="stylesheet" href="style.css" type="text\/css" \/>/, "adding html body tags and css tags");

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with non breaking text. EOPOD is($results, <<"EOHTML", "Non breaking text in a paragraph"); A plain paragraph with non breaking text.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a Newlines. EOPOD is($results, <<"EOHTML", "Link entity in a paragraph"); A plain paragraph with a <a href="$PERLDOC/Newlines">Newlines</a>.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a "Newlines" in perlport. EOPOD is($results, <<"EOHTML", "Link entity in a paragraph"); A plain paragraph with a <a href="$PERLDOC/perlport#Newlines">"Newlines" in perlport</a>.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a Boo. EOPOD is($results, <<"EOHTML", "A link in a paragraph"); A plain paragraph with a <a href="http://link.included.here">Boo</a>.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a http://link.included.here. EOPOD is($results, <<"EOHTML", "A link in a paragraph"); A plain paragraph with a <a href="http://link.included.here">http://link.included.here</a>.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a http://link.included.here?o=1&p=2. EOPOD is($results, <<"EOHTML", "A link in a paragraph"); A plain paragraph with a <a href="http://link.included.here?o=1&p=2">http://link.included.here?o=1&p=2</a>.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with bold text. EOPOD is($results, <<"EOHTML", "Bold text in a paragraph"); A plain paragraph with bold text.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with italic text. EOPOD is($results, <<"EOHTML", "Italic text in a paragraph"); A plain paragraph with italic text.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A plain paragraph with a filename. EOPOD is($results, <<"EOHTML", "File name in a paragraph"); A plain paragraph with a filename.

EOHTML

# It's not important that 's (apostrophes) be encoded for XHTML output. initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

# this header is very important & dont you forget it
my $text = "File is: " . <FILE>;
EOPOD
is($results, <<"EOHTML", "Verbatim text with encodable entities");
<pre><code>  # this header is very important &amp; dont you forget it
my \$text = &quot;File is: &quot; . &lt;FILE&gt;;</code></pre>

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A text paragraph using / and | special POD entities.

EOPOD is($results, <<"EOHTML", "Text with decodable entities"); A text paragraph using / and | special POD entities.

EOHTML

initialize($parser, $results); $parser->parse_string_document(<<'EOPOD'); =pod

A text paragraph using numeric POD entities: <, >.

EOPOD is($results, <<"EOHTML", "Text with numeric entities"); A text paragraph using numeric POD entities: <, >.

EOHTML

my $html = q{<tt> <pre> #include <stdio.h>

int main(int argc,char *argv[]) {

printf("Hellow World\n");
return 0;

} </pre> </tt>}; initialize($parser, $results); $parser->parse_string_document("=begin html\n\n$html\n\n=end html\n"); is($results, "$html\n\n", "Text with =begin html");

SKIP: for my $use_html_entities (0, 1) { if ($use_html_entities and not $Pod::Simple::XHTML::HAS_HTML_ENTITIES) { skip("HTML::Entities not installed", 3); } local $Pod::Simple::XHTML::HAS_HTML_ENTITIES = $use_html_entities; initialize($parser, $results); $parser->codes_in_verbatim(1); $parser->parse_string_document(<<'EOPOD'); =pod

# this header is very important & dont you forget it
B<my $file = <FILEE<gt> || Blank!;>
my $text = "File is: " . <FILE>;
EOPOD
is($results, <<"EOHTML", "Verbatim text with markup and embedded formatting");
<pre><code>  # this header is very important &amp; dont you forget it
<b>my \$file = &lt;FILE&gt; || Blank!;</b>
my \$text = &quot;File is: &quot; . &lt;FILE&gt;;</code></pre>

EOHTML

# Specify characters to encode.
initialize($parser, $results);
$parser->html_encode_chars('><"&T');
$parser->parse_string_document(<<'EOPOD');
=pod

This is Anna's "Answer" to the <q>Question</q>.

9 POD Errors

The following errors were encountered while parsing the POD:

Around line 111:: '=item' outside of any '=over'
Around line 141:: '=item' outside of any '=over'
Around line 194:: '=item' outside of any '=over'
Around line 224:: '=item' outside of any '=over'
Around line 276:: '=item' outside of any '=over'
Around line 311:: '=item' outside of any '=over'
Around line 344:: '=item' outside of any '=over'
Around line 369:: '=item' outside of any '=over'
Around line 410:: '=item' outside of any '=over'

To install less, copy and paste the appropriate command in to your terminal.

cpanm

cpanm less

CPAN shell

perl -MCPAN -e shell
install less

For more information on module installation, please visit the detailed CPAN module installation guide.

	Global
`s`	Focus search bar
`?`	Bring up this help dialog

	GitHub
`g` `p`	Go to pull requests
`g` `i`	Go to GitHub issues (only if GitHub is preferred repository)

	POD
`g` `a`	Go to author
`g` `c`	Go to changes
`g` `i`	Go to issues
`g` `d`	Go to dist
`g` `r`	Go to repository/SCM
`g` `s`	Go to source
`g` `b`	Go to file browse

Search terms
module: (e.g. module:Plugin)
distribution: (e.g. distribution:Dancer auth)
author: (e.g. author:SONGMU Redis)
version: (e.g. version:1.00)

Module Install Instructions

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