Medium 5.3Published Oct 16, 2026

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

Updated under an hour ago (2026-10-19 07:10 UTC)

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Every CVE for mz-automation libiec61850

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-415, CWE-664, CWE-672
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 16, 2026

Affected products

Affected products

mz-automation libiec61850 mz_automation:libiec61850 (from the name)	from 1.6.1, < 1.6.2	CNA record

References

https://github.com/mz-automation/libiec61850/security/advisories/GHSA-cxgr-7v9h-fj9px-refsource-confirm
https://github.com/mz-automation/libiec61850/commit/d86b4a9c7a903641819235e1678b18901518f3cdx-refsource-misc
https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.