Vulnerability Description
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.
CVSS Score
5.9
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Related Weaknesses (CWE)
References
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-21
- https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d
- https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605
- https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b89
- https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb3
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08
- https://www.o6-automation.com/contact
FAQ
What is CVE-2026-63362?
CVE-2026-63362 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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.
How severe is CVE-2026-63362?
CVE-2026-63362 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63362?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.