{"id":"CVE-2026-48741","summary":"libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS","details":"libIEC61850 is an open-source implementation of IEC 61850 client and server protocols including MMS, GOOSE, Sampled Values, and R-Session. Prior to 1.6.2, alternateArrayAccess in src/mms/iso_mms/server/mms_read_service.c does not validate an alternate-access sub-array range when numberOfElements is greater than zero. An out-of-range MmsValue_getElement call returns NULL, and the sub-array branch passes that value to MmsValue_isDeletable, causing a NULL pointer dereference. A remote MMS Read request can therefore crash servers whose data models contain arrays, while the single-element error path handles the same invalid index safely. This issue is fixed in version 1.6.2.","aliases":["GHSA-8mfr-hq64-9w33"],"modified":"2026-10-17T02:48:23.073304716Z","published":"2026-10-16T15:45:32.680Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48741.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-129","CWE-252","CWE-476","CWE-754"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48741.json"},{"type":"FIX","url":"https://github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce1404bfb8a411"},{"type":"WEB","url":"https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2"},{"type":"ADVISORY","url":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48741"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mz-automation/libiec61850","events":[{"introduced":"0"},{"fixed":"f0f797bf955da763353f7081c892a1ff6b55e5a1"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.6.2"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.6.1","v1.6.0","v1.4.1","v1.4.0","v1.2.0","v1.3.0","v1.2.2","v1.2.1","v1.1","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48741.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}