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
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.
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
Relevant CWE: CWE-191 Integer Underflow (Wrap or Wraparound)
Metrics
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.
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
Relevant CWE: CWE-190 Integer Overflow or Wraparound
Metrics
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.
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
Relevant CWE: CWE-416 Use After Free
Metrics
CVE-2026-63559
An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to read out-of-bounds heap memory, potentially disclosing sensitive information.
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
Relevant CWE: CWE-190 Integer Overflow or Wraparound
Metrics
Acknowledgments
- Asher Davila of Palo Alto Networks reported these vulnerabilities to CISA
- Abhinav Agarwal reported these vulnerabilities to CISA
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as virtual private networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-07-30
| Date | Revision | Summary |
|---|---|---|
| 2026-07-30 | 1 | Initial Publication |