CVE-2026-57446

MEDIUM 5.3

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

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-415 CWE-664 CWE-672
Vendor	mz-automation
Product	libiec61850
Published	Oct 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

mz-automation / libiec61850

>= 1.6.1, < 1.6.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/mz-automation/libiec61850/security/advisories/GHSA-cxgr-7v9h-fj9p github.com: https://github.com/mz-automation/libiec61850/commit/d86b4a9c7a903641819235e1678b18901518f3cd github.com: https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2