/ 
perl-5.44.0
⭐ Starred 2013 / Pod::Perldoc::BaseTo
Security Advisories (1)
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

Pod::Perldoc::BaseTo - Base for Pod::Perldoc formatters

SYNOPSIS

package Pod::Perldoc::ToMyFormat;

use parent qw( Pod::Perldoc::BaseTo );
...

DESCRIPTION

This package is meant as a base of Pod::Perldoc formatters, like Pod::Perldoc::ToText, Pod::Perldoc::ToMan, etc.

It provides default implementations for the methods

is_pageable
write_with_binmode
output_extension
_perldoc_elem

The concrete formatter must implement

new
parse_from_file

SEE ALSO

perldoc

COPYRIGHT AND DISCLAIMERS

Copyright (c) 2002-2007 Sean M. Burke.

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

This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

AUTHOR

Current maintainer: Mark Allen <mallen@cpan.org>

Past contributions from: brian d foy <bdfoy@cpan.org> Adriano R. Ferreira <ferreira@cpan.org>, Sean M. Burke <sburke@cpan.org>