CVE-2026-67858

Published: Aug 4, 2026Modified: Aug 31, 2026Deferred

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: MITRE (Secondary)

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.

Related CWEs

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

References (6)

https://github.com/open62541/open62541/blob/master/doc/building.rst

Source: cve@mitre.org

https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c

Source: cve@mitre.org

https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c

Source: cve@mitre.org

https://github.com/open62541/open62541/issues/8094

Source: cve@mitre.org

https://github.com/open62541/open62541/tree/master/examples/discovery

Source: cve@mitre.org

https://github.com/open62541/open62541/issues/8094

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

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