CVE-2026-49035 Stack-based Buffer Overflow in MZ Automation libIEC61850
A heap-based buffer overflow in libIEC61850 allows remote code execution when ASLR is disabled, or denial of service otherwise.
- 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-2026-49035?
CVE-2026-49035 is a critical memory corruption vulnerability in MZ Automation libIEC61850, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The affected product is vulnerable to a heap-based buffer overflow via a crafted MMS Initiate request. Remote code execution (RCE) has been demonstrated when ASLR is disabled; memory corruption or denial of service may occur in configurations where ASLR is enabled.
Weakness: CWE-122
Which versions are affected by CVE-2026-49035?
How do I fix CVE-2026-49035?
No fix has been published for CVE-2026-49035 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-2026-49035 being exploited?
There is no known exploitation of CVE-2026-49035 in the wild and no public exploit code.
Sources
Also known as GHSA-4r66-gmmr-3ww8.