CVE-2026-19259 Memory corruption in libiec61850
A heap-based buffer overflow in libiec61850 allows local attackers to execute arbitrary code or cause denial of service via crafted MMS protocol data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19259?
CVE-2026-19259 is a medium-severity memory corruption vulnerability in MZ Automation libiec61850, published on 8 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been found in MZ Automation libiec61850 up to 1.6.1. The affected element is the function MmsMapping_varAccessSpecToObjectReference of the file src/iec61850/common/iec61850_common.c of the component MMS Protocol Workflow. Such manipulation of the argument GetNamedVariableListAttributesResponse.itemId leads to heap-based buffer overflow. The attack must be carried out locally. The exploit has been disclosed to the public 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-2026-19259?
How do I fix CVE-2026-19259?
No fix has been published for CVE-2026-19259 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-2026-19259 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19259 exists.
Sources
Also known as GHSA-36pq-cx6x-rc54.