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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-48741
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-16 16:18:11 UTC
Updated2026-10-21 03:17:19 UTC
DescriptionlibIEC61850 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-129 | CWE-252 | CWE-476 | CWE-754 | CWE-129 CWE-129: Improper Validation of Array Index | CWE-252 CWE-252: Unchecked Return Value | CWE-476 CWE-476: NULL Pointer Dereference | CWE-754 CWE-754: Improper Check for Unusual or Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mz-automation Libiec61850 affected < 1.6.2 Not specified

References

ReferenceSourceLinkTags
github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce... [email protected] github.com
github.com/mz-automation/libiec61850/releases/tag/v1.6.2 [email protected] github.com
github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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