Unrated severityNVD Advisory· Published Aug 4, 2026· Updated Aug 4, 2026
CVE-2026-67858
CVE-2026-67858
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.
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Affected products
1Patches
Vulnerability mechanics
References
5- github.com/open62541/open62541/blob/master/doc/building.rstmitre
- github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.cmitre
- github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.cmitre
- github.com/open62541/open62541/issues/8094mitre
- github.com/open62541/open62541/tree/master/examples/discoverymitre
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