CVE-2026-48741

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, alternateArrayAccess in src/mms/iso_mms/server/mms_read_service.c does not validate an alternate-access sub-array range when numberOfElements is greater than zero. An out-of-range MmsValue_getElement call returns NULL, and the sub-array branch passes that value to MmsValue_isDeletable, causing a NULL pointer dereference. A remote MMS Read request can therefore crash servers whose data models contain arrays, while the single-element error path handles the same invalid index safely. This issue is fixed in version 1.6.2.

• CWE-129
• CWE-252
• CWE-476
• CWE-754

• https://github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce1404bfb8a411
• https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2
• https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33
• https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33

Published

Oct 16, 2026

Last Modified

Oct 21, 2026

Status

Deferred

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