{"id":"UBUNTU-CVE-2026-67863","details":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","modified":"2026-08-13T00:13:02Z","published":"2026-08-05T23:16:00Z","upstream":["CVE-2026-67863"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-67863"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-67863"},{"type":"REPORT","url":"https://github.com/open62541/open62541/issues/8131"},{"type":"REPORT","url":"https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h"},{"type":"REPORT","url":"https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c"},{"type":"REPORT","url":"https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c"}],"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-2026-67863.json"}}],"schema_version":"1.9.0","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"}]}