Vulnerability DatabaseCVE-2026-67858
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CVE-2026-67858
Published:August 04, 2026
Updated:August 05, 2026
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.
Related Resources (5)
https://github.com/open62541/open62541/tree/master/examples/discovery
https://github.com/open62541/open62541/blob/master/doc/building.rst
https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c
https://github.com/open62541/open62541/issues/8094
https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Complexity
LOW
Attack Vector
NETWORK
Availability
HIGH
Confidentiality
NONE
Integrity
NONE
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
NONE
Weakness Type (CWE)
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-120