{"id":"CVE-2026-65423","state":"PUBLISHED","title":"o6 Automation open62541 Integer Overflow or Wraparound","description":"An integer overflow in the UA_Variant arrayDimensions product \ncomputation in open62541 may allow a remote attacker to trigger an \nout-of-bounds write.","publishedAt":"2026-07-30T21:59:06.093Z","updatedAt":"2026-08-24T17:52:15.835Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"icscert"},"assigner":"icscert","products":["o6 Automation open62541"],"affected":[{"vendor":"o6 Automation","product":"open62541","defaultStatus":"unaffected","versions":[{"version":"1.3.0","status":"affected","lessThanOrEqual":"1.3.17","versionType":"custom"},{"version":"1.4.0","status":"affected","lessThanOrEqual":"1.4.16","versionType":"custom"},{"version":"1.5.0","status":"affected","lessThanOrEqual":"1.5.4","versionType":"custom"},{"version":"master","status":"affected"}],"platforms":["Windows","Linux"]}],"references":["https://www.o6-automation.com/contact","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","https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08","https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/65xxx/CVE-2026-65423.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-65423","state":"PUBLISHED","datePublished":"2026-07-30T21:59:06.093Z","dateUpdated":"2026-08-24T17:52:15.835Z","assignerShortName":"icscert","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateReserved":"2026-07-27T15:02:47.797Z"},"containers":{"cna":{"title":"o6 Automation open62541 Integer Overflow or Wraparound","descriptions":[{"lang":"en","value":"An integer overflow in the UA_Variant arrayDimensions product \ncomputation in open62541 may allow a remote attacker to trigger an \nout-of-bounds write."}],"affected":[{"vendor":"o6 Automation","product":"open62541","defaultStatus":"unaffected","versions":[{"version":"1.3.0","status":"affected","lessThanOrEqual":"1.3.17","versionType":"custom"},{"version":"1.4.0","status":"affected","lessThanOrEqual":"1.4.16","versionType":"custom"},{"version":"1.5.0","status":"affected","lessThanOrEqual":"1.5.4","versionType":"custom"},{"version":"master","status":"affected"}],"platforms":["Windows","Linux"]}],"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":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","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":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190","type":"CWE"}]}],"providerMetadata":{"shortName":"icscert","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateUpdated":"2026-08-24T17:52:15.835Z"},"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":"<p>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&nbsp;&nbsp;<a href=\"https://www.o6-automation.com/contact\">https://www.o6-automation.com/contact</a>\nor by downloading from the \nfollowing locations:<br><a href=\"https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f\">https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f</a><br><a href=\"https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60\">https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60</a><br><a href=\"https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e\">https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e</a><br><a href=\"https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df\">https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df</a></p>\n<p>For more information, see open62541 \nSecurity Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or \ncontact o6 Automation:&nbsp;<a href=\"https://www.o6-automation.com/contact\">https://www.o6-automation.com/contact</a></p>"}]}],"credits":[{"lang":"en","value":"Abhinav Agarwal reported this vulnerability to CISA.","type":"finder"},{"lang":"en","value":"Asher Davila and Malav Vyas of Palo Alto Networks reported this vulnerability to CISA.","type":"finder"}],"source":{"advisory":"ICSA-26-211-08","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T15:47:23.959371Z","id":"CVE-2026-65423","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-31T15:47:55.815Z"}}]}}}