What’s Vulnerable › Vulnerabilities

CVE-2026-65421: MZ Automation libiec61850 Out-of-bounds Read

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-23
• Weakness: CWE-125

Description

The MMS BER decoder contains a flaw in decoding fixed-width BER fields (boolean/integer): an attacker-supplied length value is not validated, causing a read past the end of a heap buffer. This leads to termination of the MMS service process and a denial-of-service condition.

Affected products

• mz-automation libiec61850: before 1.6.2 — fixed in 1.6.2

How to fix

Upgrade to a fixed version: mz-automation libiec61850 1.6.2. Check the vendor advisory for mitigations.

References

• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10

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