{ "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   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:  https://www.o6-automation.com/contact", "supportingMedia": [ { "type": "text/html", "base64": false, "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  https://www.o6-automation.com/contact\nor by downloading from the \nfollowing locations:
https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f
https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60
https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e
https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df

\n

For more information, see open62541 \nSecurity Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or \ncontact o6 Automation: https://www.o6-automation.com/contact

" } ] } ], "credits": [ { "lang": "en", "value": "Abhinav Agarwal reported this vulnerability to CISA.", "type": "finder" } ], "source": { "advisory": "ICSA-26-211-08", "discovery": "EXTERNAL" }, "x_generator": { "engine": "Vulnogram 1.0.4" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-07-31T15:48:12.482282Z", "id": "CVE-2026-63362", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-31T15:48:40.485Z" } } ] } }