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Vulnerability · Published Oct 10, 2026 · Assigned by CPANSec

CVE-2026-107373ExtUtils::Typemaps::STL::String versions before 1.06 for Perl T_STD_STRING typemap may read the SV length before stringifying the argument

Critical 9.1

In plain English

A critical-severity out-of-bounds read in ExtUtils-Typemaps-Default. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.4%top 67.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libextutils-typemaps-default-perlno fix listedDEBIAN-CVE-2026-107373
Debian:13libextutils-typemaps-default-perlno fix listedDEBIAN-CVE-2026-107373
Debian:14libextutils-typemaps-default-perl1.07-1DEBIAN-CVE-2026-107373
Ubuntu:22.04:LTSlibextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107373
Ubuntu:24.04:LTSlibextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107373
Ubuntu:26.04:LTSlibextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107373
Ubuntu:26.10libextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107373

Affected products (as reported)

VendorProductVersions
ExtUtils-Typemaps-Default 0 – before 1.06

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References