CVE-2026-51218 Memory corruption in n/a
A heap buffer overflow in snap7 allows attackers to cause a Denial of Service via crafted packets, affecting systems using this S7 communication library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-51218?
CVE-2026-51218 is a high-severity memory corruption vulnerability in n/a, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoS) via a crafted packet.
Weakness: CWE-122
Which versions are affected by CVE-2026-51218?
How do I fix CVE-2026-51218?
No fix has been published for CVE-2026-51218 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-2026-51218 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51218 exists.
Sources
Also known as GHSA-6m46-rpq9-jh59.