{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63362", "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "state": "PUBLISHED", "assignerShortName": "icscert", "dateReserved": "2026-07-27T15:02:47.793Z", "datePublished": "2026-07-30T22:01:48.523Z", "dateUpdated": "2026-07-31T15:48:40.485Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-07-30T22:01:48.523Z"}, "title": "o6 Automation open62541 Integer Underflow", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-191", "description": "CWE-191", "type": "CWE"}]}], "affected": [{"vendor": "o6 Automation", "product": "open62541", "platforms": ["Windows", "Linux"], "versions": [{"status": "affected", "version": "1.3.0", "lessThanOrEqual": "1.3.17", "versionType": "custom"}, {"status": "affected", "version": "1.4.0", "lessThanOrEqual": "1.4.16", "versionType": "custom"}, {"status": "affected", "version": "1.5.0", "lessThanOrEqual": "1.5.4", "versionType": "custom"}, {"status": "affected", "version": "master"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "An unsigned integer underflow in the PubSub signature verification path \nin open62541 may allow a remote attacker to cause a denial of service \nvia a crafted UDP packet.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "An unsigned integer underflow in the PubSub signature verification path \nin open62541 may allow a remote attacker to cause a denial of service \nvia a crafted UDP packet."}]}], "references": [{"url": "https://www.o6-automation.com/contact"}, {"url": "https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f"}, {"url": "https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60"}, {"url": "https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e"}, {"url": "https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df"}, {"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08"}, {"url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "MEDIUM", "baseScore": 5.9, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "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": 8.2, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}], "solutions": [{"lang": "en", "value": "o6 Automation has prepared mitigations and fixes to address these \nissues and recommends that users update to the newest version. The new \nversion can be obtained by contacting o6 Automation\u00a0\u00a0 https://www.o6-automation.com/contact \nor by downloading from the \nfollowing locations:\n https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f \n https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 \n https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e \n https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df \n\n\n\n\nFor more information, see open62541 \nSecurity Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or \ncontact o6 Automation:\u00a0 https://www.o6-automation.com/contact", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>o6 Automation has prepared mitigations and fixes to address these \nissues and recommends that users update to the newest version. 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{"affected": [{"configurations": [{"platform": ["windows", "linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[1.3.0,1.3.17]"}}, {"platform": ["windows", "linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[1.4.0,1.4.16]"}}, {"platform": ["windows", "linux"], "status": "affected", "versions": {"scheme": "semver", "value": "[1.5.0,1.5.4]"}}, {"platform": ["windows", "linux"], "status": "affected", "versions": {"scheme": "generic", "value": "master"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "open62541", "source": "cna", "vendor": "o6 Automation"}, "product": "open62541", "vendor": "o6_automation"}], "created": "2026-08-02T20:34:18.190081+00:00", "updated": "2026-08-02T20:34:18.190120+00:00", "vendors": ["o6_automation", "o6_automation$PRODUCT$open62541"]}