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perl-5.45.1
⭐ Starred 2013 / ExtUtils::Miniperl
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

ExtUtils::Miniperl - write the C code for miniperlmain.c and perlmain.c

SYNOPSIS

use ExtUtils::Miniperl;
writemain(@directories);
# or
writemain($fh, @directories);
# or
writemain(\$filename, @directories);

DESCRIPTION

writemain() takes an argument list of zero or more directories containing archive libraries that relate to perl modules and should be linked into a new perl binary. It writes a corresponding miniperlmain.c or perlmain.c file that is a plain C file containing all the bootstrap code to make the modules associated with the libraries available from within perl. If the first argument to writemain() is a reference to a scalar it is used as the filename to open for output. Any other reference is used as the filehandle to write to. Otherwise output defaults to STDOUT.

The typical usage is from within perl's own Makefile (to build perlmain.c) or from regen/miniperlmain.pl (to build miniperlmain.c). So under normal circumstances you won't have to deal with this module directly.

SEE ALSO

ExtUtils::MakeMaker