High severity7.5NVD Advisory· Published Aug 4, 2026· Updated Aug 31, 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/open62541/open62541/blob/master/doc/building.rstnvd
- github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.cnvd
- github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.cnvd
- github.com/open62541/open62541/issues/8094nvd
- github.com/open62541/open62541/tree/master/examples/discoverynvd
News mentions
1- Open62541: 14 Critical and High-Severity Vulnerabilities Disclosed TogetherVypr Intelligence · Aug 6, 2026