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TI-2026-47129 Aliases CVE-2026-66349GHSA-8m3p-4g59-6h2r

MZ Automation libiec61850 Out-of-bounds Read

Priority LOW 30CWE-125Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

The MMS server connection handler contains a flaw in its processing of BER-encoded request data. When an MMS confirmed request PDU containing an extended BER tag is received over an established session, the decoder may advance its internal buffer incorrectly due to a missing bounds check. This results in a one byte heap out-of-bounds read and causes the MMS service process to terminate, leading to a denial-of-service condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00295 22nd percentileScored 2026-11-07
Fix Fixed libiec61850 (MZ Automation GmbH): 1.6.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MZ Automationlibiec61850before 1.6.21.6.2Patch availableCNA
  • libiec61850 VendorMZ Automation Affected before 1.6.2 Fixed in 1.6.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mz-automation:libiec61850:*:*:*:*:*:*:*:*——MZ Automation
  • cpe:2.3:a:mz-automation:libiec61850:*:*:*:*:*:*:*:* Versions — — ·MZ Automation

Remediation

  • Fix · CNA libiec61850 (MZ Automation GmbH) Fixed in 1.6.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    MZ Automation libiec61850 1.6.2

    8 records Highest priority Priority MEDIUM 1 MEDIUM, 7 LOW

    Other records, highest priority first

    • TI-2026-47133 MZ Automation libiec61850 Out-of-bounds ReadPriority MEDIUM 44
    • TI-2026-45265 MZ Automation libiec61850 Out-of-bounds ReadPriority LOW 32
    • TI-2026-47382 MZ Automation libiec61850 Out-of-bounds ReadPriority LOW 31
    Show all 8 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-66349
  2. 2026-10-03 Alias added: GHSA-8m3p-4g59-6h2r

References

Other 2

  • TI-2026-75355 Infinite loop and out-of-bounds read in libIEC61850 ACSE parsing CVSS 4.0HIGH 8.7
  • TI-2026-75345 Remote NULL dereference in libIEC61850 MMS Read crashes servers CVSS 3.1HIGH 7.5
  • TI-2026-75344 Remote information disclosure in libIEC61850 MMS file service CVSS 3.1HIGH 7.5
  • TI-2024-18824 In mz-automation libiec61850 v1.4.0, a NULL Pointer Dereference was detected in the… CVSS 3.1HIGH 7.5
  • TI-2022-05561 Infinite loop in MZ Automation libiec61850 CVSS 3.1HIGH 7.5
  • TI-2026-45011 MZ Automation lib60870 Out-of-bounds Read CVSS 4.0MEDIUM 6.9
See all 64 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences