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Vulnerability details

CVE-2026-68907

MZ Automation libIEC61850

libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset creation due to reversed StringUtils_copyStringToBuffer arguments

CVSS 4.0
8.2High

Official description

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.

CVSS scores

ScoreVersionSourceVector
8.2High 4.0 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected products

VendorProductVersionsSource
MZ Automation libIEC61850 < 1.6.2 CVEProject cvelistV5 (CNA)

References and advisories

3
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Details

Published
2026-10-16
Last updated
2026-10-16
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.37%
Probability of exploitation in 30 days
31.2%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-125
    Out-of-bounds Read
  • CWE-457
    Use of Uninitialized Variable
  • CWE-628
    Function Call with Incorrectly Specified Arguments