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

CVE-2026-107794 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-107794, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-107794
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 10, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libextutils-typemaps-default-perl Debian 14 | 1.07-1 | [DEBIAN-CVE-2026-107794](https://patchblox.com/security/data/fix/linux/debian-cve-2026-107794.md) | Oct 13, 2026 |
| Linux | perl-ExtUtils-Typemaps-Default Fedora 43 | 1.07-1.fc43 | [FEDORA-2026-6186A0239F](https://patchblox.com/security/data/fix/linux/fedora-2026-6186a0239f.md) | Nov 7, 2026 |

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