Buffer overflow in Mz Automation Libiec61850
CVE-2026-19259
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Mz Automation Libiec61850 — versions 1.6.0, 1.6.1
Weakness classification (CWE)
References
- vuldb.com/vuln/387009 (technical-description, vdb-entry)
- vuldb.com/vuln/387009/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-19259 (third-party-advisory)
- vuldb.com/submit/865176 (third-party-advisory)
- github.com/mz-automation/libiec61850/issues/599 (issue-tracking)
- github.com/user-attachments/files/29190426/PoC.zip (exploit)
Frequently asked questions
- What is CVE-2026-19259?
- CVE-2026-19259 is a medium-severity vulnerability in Mz Automation Libiec61850, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-08-08.
- How severe is CVE-2026-19259?
- Medium severity. CVSS v3 base score is 5.3 out of 10.