High severity · published Oct 16, 2026
CVE-2026-48741
libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libiec61850 · mz-automation
< 1.6.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48741
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48741
github.com
https://github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce1404bfb8a411
github.com
https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2
github.com
https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33
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