{"id":"CVE-2026-48741","title":"libIEC61850: Remote NULL dereference in MMS Read alternate-access sub-array path leads to server-side DoS","summary":"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 validat…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-129","CWE-252","CWE-476","CWE-754"],"vendor":"mz-automation","product":"libiec61850","affected":["libiec61850 < 1.6.2"],"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-21T02:22:14.586024Z"},"exploitAvailable":true,"published":"2026-10-16","updated":"2026-10-21","sourceUpdated":"2026-10-21T02:22:38.275Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-48741","references":[{"url":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33","label":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-8mfr-hq64-9w33"},{"url":"https://github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce1404bfb8a411","label":"https://github.com/mz-automation/libiec61850/commit/7c15310405def00cac628ebde4ce1404bfb8a411"},{"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","exploit-available"],"epss":0.00524,"epssPercentile":0.44268,"ingestedAt":"2026-10-16T17:24:46.829Z","slug":"CVE-2026-48741","body":"## Overview\n\nlibIEC61850 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.\n\n## Affected\n\n- `libiec61850 < 1.6.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":226797,"id":"CVE-2026-48741","ts":1792550346829,"field":"exploit_available","old":"false","new":"true"}]}