CVE-2026-15105 davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write
An out-of-bounds write in snap7's ReadVar handler allows local network attackers to execute code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15105?
CVE-2026-15105 is a medium-severity memory corruption vulnerability in davenardella snap7, published on 8 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-15105?
How do I fix CVE-2026-15105?
No fix has been published for CVE-2026-15105 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-15105 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15105 exists.
Sources
Also known as GHSA-x9cg-5m94-27cv, UBUNTU-CVE-2026-15105.