CVE-2026-16225 davenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds write
Remote attackers can trigger an out-of-bounds write in snap7's PDU negotiation, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16225?
CVE-2026-16225 is a medium-severity memory corruption vulnerability in davenardella snap7, published on 19 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in davenardella snap7 up to 1.4.3. The impacted element is the function TSnap7Peer::NegotiatePDULength of the file src/core/s7_peer.cpp. The manipulation of the argument PDULength results in out-of-bounds write. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-16225?
How do I fix CVE-2026-16225?
No fix has been published for CVE-2026-16225 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-2026-16225 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16225 exists.
Sources
Also known as GHSA-cc6f-5g4h-cf75.