Is CVE-2026-107794 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-107794 being exploited in the wild.

How severe is CVE-2026-107794?

Informational severity, published 10 October 2026.

Which products and versions are affected?

CPAN ExtUtils::Typemaps::STL::List before 1.07.

Is there a fix for CVE-2026-107794?

Yes: fixed in ExtUtils::Typemaps::STL::List 1.07. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-107794 attacked?

It is attacked over the network or with local access, in a software library.

Am I affected by CVE-2026-107794?

Check whether you run CPAN ExtUtils::Typemaps::STL::List at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-107794: ExtUtils::Typemaps::STL::List memory exhaustion via av_extend integer underflow

CVE-2026-107794 · Severity: info · Published 2026-10-10

ExtUtils::Typemaps::STL::List is a Perl library used to convert data types between Perl and C. A flaw in its OUTPUT typemaps causes it to allocate a 32 GiB array when processing an empty list, exhausting system memory and potentially causing application outages.

Vendors: CPAN.

Quick answers

Is CVE-2026-107794 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-107794 being exploited in the wild.
How severe is CVE-2026-107794?: Informational severity, published 10 October 2026.
Which products and versions are affected?: CPAN ExtUtils::Typemaps::STL::List before 1.07.
Is there a fix for CVE-2026-107794?: Yes: fixed in ExtUtils::Typemaps::STL::List 1.07. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-107794 attacked?: It is attacked over the network or with local access, in a software library.
Am I affected by CVE-2026-107794?: Check whether you run CPAN ExtUtils::Typemaps::STL::List at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: ExtUtils::Typemaps::STL::List 1.07

Technical details

The OUTPUT typemaps incorrectly call av_extend(av, len-1), which on an empty list (len=0) causes integer underflow; av_extend then attempts to allocate 2^32 array slots, triggering memory exhaustion. This affects type conversions from C structures to Perl, triggered when XS code passes an empty list through the typemap.

Affected products

CPAN ExtUtils::Typemaps::STL::List before 1.07

Timeline

2026-10-10: disclosed

References

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