CVE-2026-48741: high-severity vulnerability in mz-automation libiec61850
libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
mz-automation · libiec61850Related CVEs — mz-automation libiec61850
In the same product, most dangerous first.
CVE-2020-15158HIGHHeap buffer overflow in libIEC61850EPSS 2.0%CVE-2019-1010300—CVE-2019-1010300EPSS 1.3%CVE-2026-18583MEDIUMmz-automation libiec61850 MMS Request mms_mapping.c checkDataSetAccess out-of-boundsEPSS 0.9%CVE-2026-18582MEDIUMmz-automation libiec61850 Report Sending Path reporting.c Reporting_RCBWriteAccessHandler free of memory not on the heapEPSS 0.9%CVE-2026-68906HIGHlibIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsing a malformed AARE PDUEPSS 0.5%CVE-2026-48503HIGHlibIEC61850: Remote information disclosure in MMS file service via out-of-range initialPosition in fileOpen followed by fileReadEPSS 0.5%