o6 Automation open62541

Summary

Multiple vulnerabilities have been identified in o6 Automation's open62541 software, affecting Windows and Linux versions. Successful exploitation could lead to sensitive information disclosure, denial of service, or arbitrary code execution. o6 Automation has released mitigations and fixes, recommending users update to the latest version.

Full text

ICS Advisory o6 Automation open62541 Release DateJuly 30, 2026 Alert CodeICSA-26-211-08 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to disclose sensitive information, cause a denial of service, or potentially execute arbitrary code. The following versions of o6 Automation open62541 are affected: open62541 on Windows and Linux >=from_1.3.0|<=1.3.17 (CVE-2026-63362, CVE-2026-65423, CVE-2026-63035, CVE-2026-63559) open62541 on Windows and Linux >=from_1.4.0|<=1.4.16 (CVE-2026-63362, CVE-2026-65423, CVE-2026-63035, CVE-2026-63559) open62541 on Windows and Linux >=from_1.5.0|<=1.5.4 (CVE-2026-63362, CVE-2026-65423, CVE-2026-63035, CVE-2026-63559) open62541 on Windows and Linux master (CVE-2026-63362, CVE-2026-65423, CVE-2026-63035, CVE-2026-63559) CVSS Vendor Equipment Vulnerabilities v3 8.8 o6 Automation GmbH o6 Automation open62541 Integer Underflow (Wrap or Wraparound), Integer Overflow or Wraparound, Use After Free Background Critical Infrastructure Sectors: Critical Manufacturing, Energy, Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-63362 An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet. View CVE Details Affected Products o6 Automation open62541 Vendor:o6 Automation GmbH Product Version:o6 Automation GmbH open62541 on Windows and Linux: >=from_1.3.0|<=1.3.17, o6 Automation GmbH open62541 on Windows and Linux: >=from_1.4.0|<=1.4.16, o6 Automation GmbH open62541 on Windows and Linux: >=from_1.5.0|<=1.5.4, o6 Automation GmbH open62541 on Windows and Linux: master Product Status:known_affected Remediations Mitigationo6 Automation has prepared mitigations and fixes to address these issues and recommends that users update to the newest version. The new version can be obtained by contacting o6 Automation https://www.o6-automation.com/contact or by downloading from the following locations:https://www.o6-automation.com/contact Mitigationhttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179fhttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f Mitigationhttps://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 Mitigationhttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804ehttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e Mitigationhttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97dfhttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df MitigationFor more information, see open62541 Security Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or contact o6 Automation: https://www.o6-automation.com/contacthttps://www.o6-automation.com/contact Relevant CWE: CWE-191 Integer Underflow (Wrap or Wraparound) Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.2 HIGH 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 CVE-2026-65423 An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to trigger an out-of-bounds write. View CVE Details Affected Products o6 Automation open62541 Vendor:o6 Automation GmbH Product Version:o6 Automation GmbH open62541 on Windows and Linux: >=from_1.3.0|<=1.3.17, o6 Automation GmbH open62541 on Windows and Linux: >=from_1.4.0|<=1.4.16, o6 Automation GmbH open62541 on Windows and Linux: >=from_1.5.0|<=1.5.4, o6 Automation GmbH open62541 on Windows and Linux: master Product Status:known_affected Remediations Mitigationo6 Automation has prepared mitigations and fixes to address these issues and recommends that users update to the newest version. The new version can be obtained by contacting o6 Automation https://www.o6-automation.com/contact or by downloading from the following locations:https://www.o6-automation.com/contact Mitigationhttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179fhttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f Mitigationhttps://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 Mitigationhttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804ehttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e Mitigationhttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97dfhttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df MitigationFor more information, see open62541 Security Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or contact o6 Automation: https://www.o6-automation.com/contacthttps://www.o6-automation.com/contact Relevant CWE: CWE-190 Integer Overflow or Wraparound Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 4.0 8.7 HIGH 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 CVE-2026-63035 A heap use-after-free vulnerability in the TransferSubscriptions service in open62541 may allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code. View CVE Details Affected Products o6 Automation open62541 Vendor:o6 Automation GmbH Product Version:o6 Automation GmbH open62541 on Windows and Linux: >=from_1.3.0|<=1.3.17, o6 Automation GmbH open62541 on Windows and Linux: >=from_1.4.0|<=1.4.16, o6 Automation GmbH open62541 on Windows and Linux: >=from_1.5.0|<=1.5.4, o6 Automation GmbH open62541 on Windows and Linux: master Product Status:known_affected Remediations Mitigationo6 Automation has prepared mitigations and fixes to address these issues and recommends that users update to the newest version. The new version can be obtained by contacting o6 Automation https://www.o6-automation.com/contact or by downloading from the following locations:https://www.o6-automation.com/contact Mitigationhttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179fhttps://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f Mitigationhttps://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 Mitigationhttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804ehttps://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e Mitigationhttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97dfhttps://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df MitigationFor more information, see open62541 Security Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or contact o6 Automation: https://www.o6-automation.com/contacthttps://www.o6-automation.com/contact Relevant CWE: CWE-416 Use After Free Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.1 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H 4.0 7.2 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-63559 An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a

Indicators of Compromise

• cve — CVE-2026-63559

Entities