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CVE-2026-57446— libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handle

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 客户端与服务器协议实现，支持 MMS、GOOSE、采样值（Sampled Values）以及 R-Session。在 1.6.1 至 1.6.2 版本期间，一次成功的 MMS ObtainFile 操作会关闭 MmsObtainFileTask::fileHandle，但会将一个非空（non-NULL）的过期值保留在标记为 MMS_FILE_UPLOAD_STATE_NOT_USED 的任务中。若后续 ObtainFile 请求复用了该任务且目标创建失败，则

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 >= 1.6.1, < 1.6.2 affected
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I. Basic Information for CVE-2026-57446

Vulnerability Information
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Vulnerability Title
libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handle
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. From 1.6.1 until 1.6.2, a successful MMS ObtainFile operation closes MmsObtainFileTask::fileHandle but leaves the stale non-NULL value in a task marked MMS_FILE_UPLOAD_STATE_NOT_USED. If a later ObtainFile request reuses that task and destination creation fails, MMS_FILE_UPLOAD_STATE_SEND_OBTAIN_FILE_ERROR_DESTINATION cleanup closes the stale FILE object again. Servers with the MMS file service and ObtainFile enabled can therefore be crashed remotely by the success-then-failure request sequence. 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
双重释放
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mz-automation libiec61850 >= 1.6.1, < 1.6.2 -

II. Public POCs for CVE-2026-57446

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III. Intelligence Information for CVE-2026-57446

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Patches & Fixes for CVE-2026-57446 (1)

Vendor Advisories for CVE-2026-57446 (1)

Vendor Pages for CVE-2026-57446 (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-2026-68908 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-415

V. Comments for CVE-2026-57446

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