{"id":"CVE-2026-67856","details":"An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service via crafted CreateSubscription, CreateMonitoredItems(Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions requests","modified":"2026-10-28T02:30:50.277583962Z","published":"2026-08-04T00:00:00Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67856.json","cna_assigner":"mitre"},"references":[{"type":"WEB","url":"https://github.com/open62541/open62541/blob/master/examples/access_control/server_access_control.c"},{"type":"WEB","url":"https://github.com/open62541/open62541/blob/master/src/server/ua_services_subscription.c"},{"type":"WEB","url":"https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.c"},{"type":"WEB","url":"https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.h"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67856.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67856"},{"type":"REPORT","url":"https://github.com/open62541/open62541/issues/8092"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open62541/open62541","events":[{"introduced":"0"},{"last_affected":"3bdeed5dfe8309cecabf36e04afe956b7f72ebd8"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"last_affected":"1.5.5"}],"source":"DESCRIPTION"}]}}],"versions":["v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.5.0-rc2","v1.5.0-rc1","v1.2-rc1","v1.1","v1.1-rc1","basic256sha256","v1.1-dev","v1.0-dev","v1.0-rc3","v0.2.0-RC1","v0.1.0-RC4","v0.1.0-RC1","v0.0.0-150309","v0.1-automation14"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67856.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}