What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-28
• Weakness: CWE-415

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.

Affected products

• mz-automation libiec61850: from 1.6.1, < 1.6.2

References

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

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