/ 
perl-5.39.6
⭐ Starred 2013 / Pod::Html
Security Advisories (8)
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

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.

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-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-2026-57432 (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.

NAME

Pod::Html - module to convert pod files to HTML

SYNOPSIS

use Pod::Html;
pod2html([options]);

DESCRIPTION

Converts files from pod format (see perlpod) to HTML format. It can automatically generate indexes and cross-references, and it keeps a cache of things it knows how to cross-reference.

FUNCTIONS

pod2html

pod2html("pod2html",
         "--podpath=lib:ext:pod:vms",
         "--podroot=/usr/src/perl",
         "--htmlroot=/perl/nmanual",
         "--recurse",
         "--infile=foo.pod",
         "--outfile=/perl/nmanual/foo.html");

pod2html takes the following arguments:

--backlink

Turns every head1 heading into a link back to the top of the page. By default, no backlinks are generated.

cachedir
--cachedir=name

Creates the directory cache in the given directory.

css
--css=stylesheet

Specify the URL of a cascading style sheet. Also disables all HTML/CSS style attributes that are output by default (to avoid conflicts).

flush
--flush

Flushes the directory cache.

--header
--noheader

Creates header and footer blocks containing the text of the NAME section. By default, no headers are generated.

help
--help

Displays the usage message.

htmldir
--htmldir=name

Sets the directory to which all cross references in the resulting html file will be relative. Not passing this causes all links to be absolute since this is the value that tells Pod::Html the root of the documentation tree.

Do not use this and --htmlroot in the same call to pod2html; they are mutually exclusive.

htmlroot
--htmlroot=name

Sets the base URL for the HTML files. When cross-references are made, the HTML root is prepended to the URL.

Do not use this if relative links are desired: use --htmldir instead.

Do not pass both this and --htmldir to pod2html; they are mutually exclusive.

index
--index
--noindex

Generate an index at the top of the HTML file. This is the default behaviour.

infile
--infile=name

Specify the pod file to convert. Input is taken from STDIN if no infile is specified.

outfile
--outfile=name

Specify the HTML file to create. Output goes to STDOUT if no outfile is specified.

poderrors
--poderrors
--nopoderrors

Include a "POD ERRORS" section in the outfile if there were any POD errors in the infile. This section is included by default.

podpath
--podpath=name:...:name

Specify which subdirectories of the podroot contain pod files whose HTML converted forms can be linked to in cross references.

podroot
--podroot=name

Specify the base directory for finding library pods. Default is the current working directory.

quiet
--quiet
--noquiet

Don't display mostly harmless warning messages. These messages will be displayed by default. But this is not the same as verbose mode.

recurse
--recurse
--norecurse

Recurse into subdirectories specified in podpath (default behaviour).

title
--title=title

Specify the title of the resulting HTML file.

verbose
--verbose
--noverbose

Display progress messages. By default, they won't be displayed.

Formerly Exported Auxiliary Functions

Prior to perl-5.36, the following three functions were exported by Pod::Html, either by default or on request:

  • htmlify() (by default)

  • anchorify() (upon request)

  • relativize_url() (upon request)

The definition and documentation of these functions have been moved to Pod::Html::Util, viewable via perldoc Pod::Html::Util.

Beginning with perl-5.38 these functions must be explicitly imported from Pod::Html::Util. Please modify your code as needed.

ENVIRONMENT

Uses $Config{pod2html} to setup default options.

AUTHOR

Marc Green, <marcgreen@cpan.org>.

Original version by Tom Christiansen, <tchrist@perl.com>.

SEE ALSO

perlpod

COPYRIGHT

This program is distributed under the Artistic License.