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Medium severity · published Oct 16, 2026
CVE-2026-57446
libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handle
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libiec61850 · mz-automation
>= 1.6.1, < 1.6.2 · source: vendor
Affected product
LI
libiec61850
mz-automation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57446
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57446
github.com
https://github.com/mz-automation/libiec61850/commit/d86b4a9c7a903641819235e1678b18901518f3cd
github.com
https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2
github.com
https://github.com/mz-automation/libiec61850/security/advisories/GHSA-cxgr-7v9h-fj9p
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