CVE-2026-48741: CWE-129: Improper Validation of Array Index in mz-automation libiec61850
Description
CVE-2026-48741 is a high-severity vulnerability in libIEC61850 prior to version 1.6.2. It involves improper validation of an array index in the alternateArrayAccess function, leading to a NULL pointer dereference when processing remote MMS Read requests. This can cause server crashes if the data model contains arrays. The issue is fixed in version 1.6.2.
CVSS v3.1
Score 7.5high
Affected software
mz-automation
libiec61850
pkg:github/mz-automation/libiec61850Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
libIEC61850 is an open-source implementation of IEC 61850 protocols. In versions before 1.6.2, the alternateArrayAccess function in src/mms/iso_mms/server/mms_read_service.c does not properly validate the range of an alternate-access sub-array when numberOfElements is greater than zero. An out-of-range call to MmsValue_getElement returns NULL, which is then passed to MmsValue_isDeletable, causing a NULL pointer dereference and server crash. This vulnerability can be triggered remotely via MMS Read requests targeting servers with array data models. The flaw is addressed in version 1.6.2.
Potential Impact
A remote attacker can send crafted MMS Read requests that cause the server to dereference a NULL pointer, resulting in a denial of service (server crash). There is no impact on confidentiality or integrity, but availability is severely affected.
Mitigation Recommendations
Upgrade libIEC61850 to version 1.6.2 or later, where this vulnerability is fixed. No other mitigation is required as the issue is resolved by the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-22T19:10:35.747Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad24b622cdf04f656070139
Added to database: 10/16/2026, 16:05:54 UTC
Last enriched: 10/16/2026, 16:18:27 UTC
Last updated: 10/16/2026, 16:20:48 UTC
Views: 6
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