CVE-2026-107794 ExtUtils::Typemaps::STL::List versions before 1.07 for Perl allocate a 32 GiB array on an empty list
An integer underflow in ExtUtils::Typemaps::STL::List causes excessive memory allocation on empty lists, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107794?
CVE-2026-107794 is a high-severity vulnerability, published on 10 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-191
Which versions are affected by CVE-2026-107794?
How do I fix CVE-2026-107794?
Upgrade to a fixed version.
Is CVE-2026-107794 being exploited?
There is no known exploitation of CVE-2026-107794 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107794, GHSA-h5wv-6qvp-x98v, UBUNTU-CVE-2026-107794.