libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset creation due to reversed StringUtils_copyStringToBuffer arguments
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-18583US | — | — | ||
A weakness has been identified in mz-automation libiec61850 up to 1.6.1. This issue affects the function checkDataSetAccess of the file src/iec61850/server/mms_mapping/mms_mapping.… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68907.jsonADVISORY
- https://github.com/mz-automation/libiec61850/commit/062062daf4cb50c7aa76e01d6fb4d58fc9278a7dFIX
- https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2WEB
- https://github.com/mz-automation/libiec61850/security/advisories/GHSA-7v2x-39mw-2979ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-68907ADVISORY
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