/ 
perl-5.42.2
⭐ Starred 2013 / overloading
Security Advisories (1)
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

overloading - perl pragma to lexically control overloading

SYNOPSIS

    {
	no overloading;
	my $str = "$object"; # doesn't call stringification overload
    }

    # it's lexical, so this stringifies:
    warn "$object";

    # it can be enabled per op
    no overloading qw("");
    warn "$object";

    # and also reenabled
    use overloading;

DESCRIPTION

This pragma allows you to lexically disable or enable overloading.

no overloading

Disables overloading entirely in the current lexical scope.

no overloading @ops

Disables only specific overloads in the current lexical scope.

use overloading

Reenables overloading in the current lexical scope.

use overloading @ops

Reenables overloading only for specific ops in the current lexical scope.