{"id":"UBUNTU-CVE-2026-67858","details":"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.","modified":"2026-08-06T03:11:25.447386351Z","published":"2026-08-04T22:17:00Z","upstream":["CVE-2026-67858"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-67858"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-67858"},{"type":"REPORT","url":"https://github.com/open62541/open62541/issues/8094"},{"type":"REPORT","url":"https://github.com/open62541/open62541/blob/master/doc/building.rst"},{"type":"REPORT","url":"https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c"},{"type":"REPORT","url":"https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c"},{"type":"REPORT","url":"https://github.com/open62541/open62541/tree/master/examples/discovery"}],"affected":[{"package":{"name":"open62541","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/open62541?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.11.1-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libopen62541-1.4","binary_version":"1.4.11.1-1build1"},{"binary_name":"libopen62541-1.4-tools","binary_version":"1.4.11.1-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67858.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}