CVE-2026-48741

CVE-2026-48741 · libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS

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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.

CVSS 7.5 · High · EPSS 0.4%

Published

2026-10-16T15:45:32.680Z

Updated

2026-10-21T02:22:38.275Z

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