CVE-2026-107373

Critical

Description

ExtUtils::Typemaps::STL::String versions before 1.06 for Perl T_STD_STRING typemap may read the SV length before stringifying the argument. The typemap uses $var = std::string( SvPV_nolen($arg), SvCUR($arg) ) However, evaluation order for C++ arguments is not specified, and some compilers may produce code that evalutes SvCUR($arg) first. When $arg is not a string (for example, an interger, number or a reference) then SvCUR will return an invalid value, and the program may abort or segfault.

SeverityCritical

CVSS9.1

Exploit probability—

ProductExtutils-typemaps-default

PublishedOct 10, 2026

First seenOct 10, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

ExtUtils-Typemaps-Default1.06 or later

Vendor advisories

metacpan.org/release/SMUELLER/ExtUtils-Typemaps-Default-1.06/changes

Affected products

Product	Affected versions	Fixed in
ExtUtils-Typemaps-Default	v < 1.06	1.06

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