CVE-2026-67870

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete validation flaw for non-local ExpandedNodeId targets. A remote attacker can send a crafted AddReferencesRequest with an empty targetServerUri and a non-zero targetNodeId.serverIndex, causing the target node pointer to remain NULL while execution continues."}], "id": "CVE-2026-67870", "lastModified": "2026-08-31T19:33:11.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-67870", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-06T15:48:05.523832Z", "version": "2.0.3"}}]}, "published": "2026-08-06T00:16:54.043", "references": [{"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/types.h"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_nodemanagement.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/v1.5.5/src/ua_types.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/issues/8172"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/open62541/open62541/issues/8172"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "open62541: open62541: Denial of Service via incomplete validation in AddReferences", "id": "2511857", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511857"}, "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-476", "details": ["In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete validation flaw for non-local ExpandedNodeId targets. A remote attacker can send a crafted AddReferencesRequest with an empty targetServerUri and a non-zero targetNodeId.serverIndex, causing the target node pointer to remain NULL while execution continues.", "A flaw was found in open62541. A remote attacker can exploit an incomplete validation flaw in the server-side AddReferences implementation. By sending a specially crafted request, an attacker can cause a null pointer dereference, leading to a Denial of Service (DoS) condition. This can make the server unavailable to legitimate users."], "mitigation": {"lang": "en:us", "value": "Restrict who can invoke NodeManagement / AddReferences (trusted clients only)\nand limit OPC UA server network exposure."}, "name": "CVE-2026-67870", "public_date": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67870\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67870\nhttps://github.com/open62541/open62541/blob/v1.5.5/include/open62541/types.h\nhttps://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_nodemanagement.c\nhttps://github.com/open62541/open62541/blob/v1.5.5/src/ua_types.c\nhttps://github.com/open62541/open62541/issues/8172"], "statement": "This Important denial of service flaw in open62541 allows a remote, unauthenticated attacker to crash the server. The vulnerability arises from insufficient validation of non-local ExpandedNodeId targets within the AddReferences implementation, which can lead to a NULL pointer dereference and service unavailability.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.5"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "open62541", "vendor": "open62541"}], "created": "2026-08-06T00:30:03.835998+00:00", "updated": "2026-08-06T17:45:03.267918+00:00", "vendors": ["open62541", "open62541$PRODUCT$open62541"]}