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CVE-2026-68906— libIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsing a malformed AARE PDU

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，支持 MMS、GOOSE、采样值（Sampled Values）以及 R-Session。在 1.6.2 版本之前， 中的 函数在调用 处理被截断的长形式长度（long-form length）时，若返回负的 ，会先检查 是否为零，却未对该负值进行有效验证。因此，执行流程进入 分支，导致错误被忽略，程序读取 （即越界访问），随后将解析位置重置至起始处，并重复进入相同的畸形状态。 未经身份验证的远程对等方可在关联建立阶段发送畸形的 AA

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-68906

Vulnerability Information
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Vulnerability Title
libIEC61850: Infinite loop and out-of-bounds read in ACSE parseUserInformation when parsing a malformed AARE PDU
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, parseUserInformation in src/mms/iso_acse/acse.c checks len for zero before validating the negative bufPos returned by BerDecoder_decodeLength for a truncated long-form length. The continue path therefore swallows the error, reads buffer[-1], resets parsing to the beginning, and repeats the same malformed state. An unauthenticated remote peer can send a malformed AARE PDU during association to cause an infinite CPU loop under a normal allocator or a one-byte out-of-bounds read and process abort when the preceding byte is inaccessible. 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:N/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-2026-68906

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III. Intelligence Information for CVE-2026-68906

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Vendor Pages for CVE-2026-68906 (1)

Other References for CVE-2026-68906 (2)

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

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
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-2026-68906

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