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{"bugzilla": {"description": "open62541: open62541: Denial of Service via buffer overflow in Service_Call", "id": "2511858", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511858"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["Buffer Overflow vulnerability in open62541 v1.5.5 allows a remote attacker to cause a denial of service via the Service_Call validates input arguments against runtime-resolved InputArguments metadata", "A flaw was found in open62541. A remote attacker can exploit a buffer overflow vulnerability within the Service_Call function. This vulnerability arises from improper validation of input arguments against runtime-resolved InputArguments metadata, which can lead to a denial of service (DoS)."], "mitigation": {"lang": "en:us", "value": "No practical workaround identified beyond restricting NodeManagement / method-metadata\nchanges to trusted principals and limiting network exposure of the OPC UA server."}, "name": "CVE-2026-67869", "public_date": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67869\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67869\nhttps://github.com/open62541/open62541/blob/v1.5.5/examples/tutorial_server_alarms_conditions.c\nhttps://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_method.c\nhttps://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription_alarms_conditions.c\nhttps://github.com/open62541/open62541/issues/8171"], "statement": "This Important flaw in open62541 allows a remote, unauthenticated attacker to trigger a denial of service. The vulnerability stems from insufficient validation of input arguments within the Service_Call function, which can lead to a buffer overflow and subsequent service unavailability.", "threat_severity": "Important"}

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