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

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/isomms/server/mmsreadservice.c does not validate an alternate-access sub-array range when numberOfElements is...