CVE-2026-107373 ExtUtils::Typemaps::STL::String versions before 1.06 for Perl T_STD_STRING typemap may read the SV length before stringifying the argument.
An attacker can cause a denial of service via segmentation fault or abort by passing non-string arguments to the T_STD_STRING typemap due to undefined evaluation order.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107373?
CVE-2026-107373 is a critical memory corruption 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::String versions before 1.06 for Perl T_STD_STRING typemap may read the SV length before stringifying the argument.
The typemap uses
$var = std::string( SvPV_nolen($arg), SvCUR($arg) )
However, evaluation order for C++ arguments is not specified, and some compilers may produce code that evalutes SvCUR($arg) first.
When $arg is not a string (for example, an interger, number or a reference) then SvCUR will return an invalid value, and the program may abort or segfault.
Weakness: CWE-125
Which versions are affected by CVE-2026-107373?
How do I fix CVE-2026-107373?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-107373 being exploited?
There is no known exploitation of CVE-2026-107373 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107373, GHSA-g3mm-4ggm-mrv5, UBUNTU-CVE-2026-107373.