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Vulnerability · Published Oct 10, 2026 · Assigned by CPANSec

CVE-2026-107794ExtUtils::Typemaps::STL::List versions before 1.07 for Perl allocate a 32 GiB array on an empty list

High 7.5

In plain English

A high-severity security flaw 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 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 70.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

ExtUtils::Typemaps::STL::List versions before 1.07 for Perl allocate a 32 GiB array on an empty list. The OUTPUT typemaps call av_extend( av, len-1 ). On an empty list, this undeflows, and av_extend will allocate an array with 2^32 slots, leading to memory exhaustion. Note that a similar issue was fixed in ExtUtils::Typemaps::STL::Vector version 1.05.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libextutils-typemaps-default-perlno fix listedDEBIAN-CVE-2026-107794
Debian:13libextutils-typemaps-default-perlno fix listedDEBIAN-CVE-2026-107794
Debian:14libextutils-typemaps-default-perl1.07-1DEBIAN-CVE-2026-107794
Ubuntu:22.04:LTSlibextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107794
Ubuntu:24.04:LTSlibextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107794
Ubuntu:26.04:LTSlibextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107794
Ubuntu:26.10libextutils-typemaps-default-perlno fix listedUBUNTU-CVE-2026-107794

Affected products (as reported)

VendorProductVersions
ExtUtils-Typemaps-Default 0 – before 1.07

Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References