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CVE-2026-68908— libIEC61850: Oversized RptID can trigger invalid free of a stack-backed visible string in the report send path

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 的客户端与服务端协议，包括 MMS、GOOSE、采样值（Sampled Values）以及 R-Session。在 1.6.2 版本之前，Reporting_RCBWriteAccessHandler 在报告控制块（report-control-block）的写入路径中，允许接收长度超过 129 字节的 RptID。随后，当 GI 触发 sendNextReportEntrySegment 对报告进行序列化时，该函数会将 rptIdBuf[130]

CVSS 5.3 · Medium

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-2026-68908

Vulnerability Information
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Vulnerability Title
libIEC61850: Oversized RptID can trigger invalid free of a stack-backed visible string in the report send path
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, Reporting_RCBWriteAccessHandler accepts an RptID longer than 129 bytes in the report-control-block write path. When GI later causes sendNextReportEntrySegment to serialize the report, the function wraps rptIdBuf[130] as a temporary MmsValue and passes it to MmsValue_setVisibleString. The setter's resize path frees the stack-backed buffer, allowing a remote client to trigger an invalid free and server crash by writing the oversized RptID and then generating a report. 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:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放并不在堆上的内存
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-2026-68908

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III. Intelligence Information for CVE-2026-68908

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Patches & Fixes for CVE-2026-68908 (1)

Vendor Advisories for CVE-2026-68908 (1)

Vendor Pages for CVE-2026-68908 (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-2026-48741 7.5 HIGH libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to
CVE-2026-57446 5.3 MEDIUM libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handl

IV. Related Vulnerabilities

Same product: libiec61850
Same vendor: mz-automation
Same weakness: CWE-590

V. Comments for CVE-2026-68908

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