CVE-2026-57446

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

State: Published
Severity: 5.3 Medium
Published: Oct 16, 2026
Updated: Oct 28, 2026
Reserved: Jun 24, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	GitHub_M

Weaknesses

CWE-415 Double Free
CWE-664 Improper Control of a Resource Through its Lifetime
CWE-672 Operation on a Resource after Expiration or Release

Affected Products

Product	Versions
libiec61850mz-automation	>= 1.6.1, < 1.6.2Affected

References

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