Is CVE-2026-67858 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-67858?

CVE-2026-67858 has a CVSS v3 severity of HIGH (7.5).

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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.