Vulnerability Description
Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/open62541/open62541/blob/master/doc/building.rst
- https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.
- https://github.com/open62541/open62541/blob/master/src/server/ua_services_discov
- https://github.com/open62541/open62541/issues/8094
- https://github.com/open62541/open62541/tree/master/examples/discovery
- https://github.com/open62541/open62541/issues/8094
FAQ
What is CVE-2026-67858?
CVE-2026-67858 is a vulnerability with a CVSS score of 7.5 (HIGH). Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker ca...
How severe is CVE-2026-67858?
CVE-2026-67858 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67858?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.