/ 
perl-5.44.0
⭐ Starred 2013 / cpan/Pod-Simple/t/emptylists.t
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.

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

print "# Testing default behavior (parse_empty_lists( FALSE )) ...\n";

is( $x->_out($pod), '<Document><over-block indent="4"><over-block indent="4"><over-block indent="4"></over-block></over-block></over-block></Document>' );

print "# Testing explicit parse_empty_lists( FALSE ) ...\n";

is( $x->_out(\&off, $pod), '<Document><over-block indent="4"><over-block indent="4"><over-block indent="4"></over-block></over-block></over-block></Document>' );

print "# Testing parse_empty_lists( TRUE ) ...\n";

is( $x->_out(\&on, $pod), '<Document><over-block indent="4"><over-block indent="4"><over-block indent="4"><over-empty indent="4"></over-empty><over-empty indent="4"></over-empty></over-block></over-block></over-block></Document>' );

1 POD Error

The following errors were encountered while parsing the POD:

Around line 34:

=back doesn't take any parameters, but you said =back POD