{"id":"CVE-2026-66369","state":"PUBLISHED","title":"MZ Automation libiec61850 Out-of-bounds Read","description":"The GOOSE parser contains an off-by-one boundary-handling flaw that can \nbe triggered by a single unauthenticated Layer-2 multicast frame on the \nprocess bus. When specific GOOSE message fields are processed, the \nparser advances its internal buffer position incorrectly, resulting in a\n heap out-of-bounds read. On affected platforms, this condition reliably\n terminates the subscriber process and causes a denial-of-service.","publishedAt":"2026-07-30T22:45:29.375Z","updatedAt":"2026-07-31T19:22:19.970Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"icscert"},"assigner":"icscert","products":["MZ Automation GmbH libiec61850"],"affected":[{"vendor":"MZ Automation GmbH","product":"libiec61850","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.6.2","versionType":"custom"},{"version":"1.6.2","status":"unaffected"}]}],"references":["https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10","https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/66xxx/CVE-2026-66369.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-66369","state":"PUBLISHED","datePublished":"2026-07-30T22:45:29.375Z","dateUpdated":"2026-07-31T19:22:19.970Z","assignerShortName":"icscert","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateReserved":"2026-07-27T19:32:49.390Z"},"containers":{"cna":{"title":"MZ Automation libiec61850 Out-of-bounds Read","descriptions":[{"lang":"en","value":"The GOOSE parser contains an off-by-one boundary-handling flaw that can \nbe triggered by a single unauthenticated Layer-2 multicast frame on the \nprocess bus. When specific GOOSE message fields are processed, the \nparser advances its internal buffer position incorrectly, resulting in a\n heap out-of-bounds read. On affected platforms, this condition reliably\n terminates the subscriber process and causes a denial-of-service."}],"affected":[{"vendor":"MZ Automation GmbH","product":"libiec61850","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.6.2","versionType":"custom"},{"version":"1.6.2","status":"unaffected"}]}],"references":[{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10"},{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseSeverity":"MEDIUM","baseScore":6.5,"vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.1,"vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125","type":"CWE"}]}],"providerMetadata":{"shortName":"icscert","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateUpdated":"2026-07-30T22:45:29.375Z"},"solutions":[{"lang":"en","value":"MZ Automation GmbH recommends that users update to version 1.6.2.","supportingMedia":[{"type":"text/html","base64":false,"value":"MZ Automation GmbH recommends that users update to version 1.6.2."}]}],"credits":[{"lang":"en","value":"Arun Babu of Central Power Research Institute reported this vulnerability to CISA.","type":"finder"}],"source":{"advisory":"ICSA-26-211-10","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T19:22:09.124532Z","id":"CVE-2026-66369","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-31T19:22:19.970Z"}}]}}}