---
id: CVE-2026-107794
title: >-
  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 )
summary: >-
  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 slot…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-191
product: ExtUtils-Typemaps-Default
affected:
  - ExtUtils-Typemaps-Default < 1.07
published: '2026-10-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:17:18.793'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107794'
references:
  - url: >-
      https://metacpan.org/release/SMUELLER/ExtUtils-Typemaps-Default-1.07/changes
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://rt.cpan.org/Public/Bug/Display.html?id=91213'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://www.cve.org/CVERecord?id=CVE-2013-10076'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
tags:
  - nvd
  - cve.org
epss: 0.00361
epssPercentile: 0.2966
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T19:24:53.026908Z'
ingestedAt: '2026-10-10T14:06:22.413Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.