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Vulnerability record · CVE-2026-67858 · published 4 August 2026

CVE-2026-67858: Classic buffer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.86% · top 43.2% CWE-120 · Classic buffer overflow Deferred
7.5CVSS 3.1 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
31 Aug 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/open62541/open62541/blob/master/doc/building.rst
https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c
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/tree/master/examples/discovery
https://github.com/open62541/open62541/issues/8094

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Source: NIST National Vulnerability Database (record CVE-2026-67858), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.