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CVE-2026-48741— libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS

Quick assessment

Affected
mz-automation libiec61850
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libIEC61850 是一个开源实现，支持 IEC 61850 客户端与服务器协议，涵盖 MMS、GOOSE、采样值（Sampled Values）及 R-Session。在 1.6.2 版本之前，位于 src/mms/iso_mms/server/mms_read_service.c 中的 alternateArrayAccess 函数在 numberOfElements 大于零时，未对替代访问子数组的范围进行验证。当调用 MmsValue_getElement 超出范围时，该函数返回 NULL；而子数组分支会

CVSS 7.5 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
mz-automation libiec61850 < 1.6.2 affected
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I. Basic Information for CVE-2026-48741

Vulnerability Information
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Vulnerability Title
libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mz-automation libiec61850 < 1.6.2 -

II. Public POCs for CVE-2026-48741

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III. Intelligence Information for CVE-2026-48741

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Patches & Fixes for CVE-2026-48741 (1)

Vendor Advisories for CVE-2026-48741 (1)

Vendor Pages for CVE-2026-48741 (1)

Same Patch Batch · mz-automation · 2026-10-16 · 6 CVEs total

CVE-2026-68906 8.7 HIGH libIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsin
CVE-2026-68907 8.2 HIGH libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset
CVE-2026-48503 7.5 HIGH libIEC61850: Remote information disclosure in MMS file service via out-of-range initialPos
CVE-2026-57446 5.3 MEDIUM libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handl
CVE-2026-68908 5.3 MEDIUM libIEC61850: Oversized RptID can trigger invalid free of a stack-backed visible string in

IV. Related Vulnerabilities

Same product: libiec61850
Same vendor: mz-automation
Same weakness: CWE-129

V. Comments for CVE-2026-48741

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