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CVE-2026-68907— libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset creation due to reversed StringUtils_copyStringToBuffer arguments

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 是一个开源的 IEC 61850 客户端和服务器协议实现，涵盖 MMS、GOOSE、采样值（Sampled Values）以及 R-Session 等。在 1.6.2 版本之前， 函数在构建 MMS_ASSOCIATION_SPECIFIC 数据集引用时，将 的源参数与目标参数顺序颠倒。该辅助函数将未初始化的 存储区域误当作源字符串处理，导致 读取超出栈缓冲区，随后将这些字节复制到由调用者拥有的 缓冲区中。远程的 请求可导致启用了动态数据集服务并安装了数据集访问处理器的服务器发生崩溃；该安全

CVSS 8.2 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
mz-automation libiec61850 < 1.6.2 affected
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I. Basic Information for CVE-2026-68907

Vulnerability Information
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Vulnerability Title
libIEC61850: Server-side out-of-bounds stack read in association-specific dynamic dataset creation due to reversed StringUtils_copyStringToBuffer arguments
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, checkDataSetAccess reverses the source and destination arguments to StringUtils_copyStringToBuffer while constructing an MMS_ASSOCIATION_SPECIFIC dataset reference. The helper treats uninitialized dataSetRef[130] storage as a source string, causing strlen to read beyond the stack buffer, and then copies those bytes into the caller-owned listName buffer. A remote defineNamedVariableList request can crash servers that have dynamic dataset service enabled and a dataset access handler installed; the advisory also observes caller stack corruption but establishes denial of service as the primary impact. This issue is fixed in version 1.6.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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-2026-68907

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III. Intelligence Information for CVE-2026-68907

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Patches & Fixes for CVE-2026-68907 (1)

Vendor Advisories for CVE-2026-68907 (1)

Vendor Pages for CVE-2026-68907 (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-2026-48503 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
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-125

V. Comments for CVE-2026-68907

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