Live › vulnerability › CVE-2026-48741
Go to dashboardlibIEC61850 prior to 1.6.2 mishandles alternate-access sub-array ranges in MMS Read requests, dereferencing a NULL pointer. A remote client can crash a server that exposes array data in its model.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Teams running an IEC 61850 server built on libIEC61850 whose data model contains arrays, and whose MMS endpoint accepts Read requests from the network. Clients only, or servers without array data in the model, are not described as affected by the sources.
No product ranges from the sources yet.
1.6.2.1.6.2 or later.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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