{"id":"CVE-2026-57446","title":"libIEC61850: Server-side double free in MMS ObtainFile task reuse due to stale FILE* handle","summary":"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…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-415","CWE-664","CWE-672"],"vendor":"mz-automation","product":"libiec61850","affected":["libiec61850 >= 1.6.1, < 1.6.2"],"published":"2026-10-16","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:46:33.549Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57446","references":[{"url":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-cxgr-7v9h-fj9p","label":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-cxgr-7v9h-fj9p"},{"url":"https://github.com/mz-automation/libiec61850/commit/d86b4a9c7a903641819235e1678b18901518f3cd","label":"https://github.com/mz-automation/libiec61850/commit/d86b4a9c7a903641819235e1678b18901518f3cd"},{"url":"https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2","label":"https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2"}],"tags":["cve.org"],"ingestedAt":"2026-10-16T17:24:46.829Z","slug":"CVE-2026-57446","body":"## Overview\n\nlibIEC61850 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.\n\n## Affected\n\n- `libiec61850 >= 1.6.1, < 1.6.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}