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TI-2026-75356 Aliases CVE-2026-68907

Out-of-bounds stack read in libIEC61850 dynamic dataset creation

Priority LOW 36CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
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 libiec61850 library from mz-automation is affected before 1.6.2. A wrong argument order in a string copy call makes the server read uninitialized stack memory past its buffer (CWE-125). A remote attacker without authentication can send a defineNamedVariableList request that crashes servers with dynamic dataset service enabled and a dataset access handler installed.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

libIEC61850 is an open-source implementation of IEC 61850 client and server protocols including MMS, GOOSE, Sampled Values, and R-Session. Prior to 1.6.2, checkDataSetAccess reverses the source and destination arguments to StringUtils_copyStringToBuffer while constructing an MMS_ASSOCIATION_SPECIFIC dataset reference. The helper treats uninitialized dataSetRef[130] storage as a source string, causing strlen to read beyond the stack buffer, and then copies those bytes into the caller-owned listName buffer. A remote defineNamedVariableList request can crash servers that have dynamic dataset service enabled and a dataset access handler installed; the advisory also observes caller stack corruption but establishes denial of service as the primary impact. This issue is fixed in version 1.6.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00371 31st percentileScored 2026-11-07
Fix Fixed libiec61850 (mz-automation): 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

Upgrade libiec61850 to version 1.6.2, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA libiec61850 (mz-automation) Fixed in 1.6.2

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-68907
  2. 2026-10-16 CISA SSVC decision points changed
  3. 2026-10-16 Priority changed: MEDIUM → LOW

References

Other 3

  • 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