CVE-2026-66360 MZ Automation libiec61850 Out-of-bounds Read
An attacker can cause a denial of service in applications using libiec61850 by sending a crafted TCP connection that triggers an out-of-bounds read.
- 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-2026-66360?
CVE-2026-66360 is a high-severity denial of service vulnerability in MZ Automation GmbH libiec61850, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The ISO Presentation layer contains a flaw in the handling of specific parameters during normal mode negotiation. A missing length check in the processing of the encoded presentation data allows an attacker controlled field with a zero length value to trigger a bounded heap over read. This condition occurs before MMS session establishment, a crafted TCP/102 connection attempt can trigger the issue. The resulting over read causes the process to terminate, leading to a denial of service condition.
Weakness: CWE-125
Which versions are affected by CVE-2026-66360?
How do I fix CVE-2026-66360?
No fix has been published for CVE-2026-66360 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-66360 being exploited?
There is no known exploitation of CVE-2026-66360 in the wild and no public exploit code.
Sources
Also known as GHSA-xhv7-j6rr-ph72.