CVE-2026-67857

{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-67857", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-08-05T14:31:49.820Z", "dateReserved": "2026-07-30T00:00:00.000Z", "datePublished": "2026-08-04T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-08-04T21:21:25.605Z"}, "descriptions": [{"lang": "en", "value": "open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/open62541/open62541/issues/8104"}, {"url": "https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c"}, {"url": "https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c"}, {"url": "https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c"}, {"url": "https://github.com/gff-cw/information/issues/9"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-125", "lang": "en", "description": "CWE-125 Out-of-bounds Read"}]}], "references": [{"url": "https://github.com/open62541/open62541/issues/8104", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-05T14:31:17.935192Z", "id": "CVE-2026-67857", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-05T14:31:49.820Z"}}]}, "dataVersion": "5.2"}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-67857", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-05T14:31:17.935192Z"}}}], "references": [{"url": "https://github.com/open62541/open62541/issues/8104", "tags": ["exploit"]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-05T14:31:45.509Z"}}], "cna": {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "references": [{"url": "https://github.com/open62541/open62541/issues/8104"}, {"url": "https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c"}, {"url": "https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c"}, {"url": "https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c"}, {"url": "https://github.com/gff-cw/information/issues/9"}], "descriptions": [{"lang": "en", "value": "open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "text", "description": "n/a"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-08-04T21:21:25.605Z"}}}, "cveMetadata": {"cveId": "CVE-2026-67857", "state": "PUBLISHED", "dateUpdated": "2026-08-05T14:31:49.820Z", "dateReserved": "2026-07-30T00:00:00.000Z", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "datePublished": "2026-08-04T00:00:00.000Z", "assignerShortName": "mitre"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c."}], "id": "CVE-2026-67857", "lastModified": "2026-08-31T19:33:11.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "cve@mitre.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-67857", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T14:31:17.935192Z", "version": "2.0.3"}}]}, "published": "2026-08-04T22:17:15.957", "references": [{"source": "cve@mitre.org", "url": "https://github.com/gff-cw/information/issues/9"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/issues/8104"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/open62541/open62541/issues/8104"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "open62541: open62541: Denial of Service via out-of-bounds read in client-side function", "id": "2511251", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511251"}, "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": ["A flaw was found in open62541. A remote attacker could exploit an out-of-bounds read vulnerability in the client-side function responseReadNamespacesArray() by sending a specially crafted network packet. This could lead to a denial of service, causing the application to crash and become unavailable."], "name": "CVE-2026-67857", "public_date": "2026-08-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67857\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67857\nhttps://github.com/gff-cw/information/issues/9\nhttps://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c\nhttps://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c\nhttps://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c\nhttps://github.com/open62541/open62541/issues/8104"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.5"}}], "enrichment": {"confidence": 75.0, "confidence_source": "inferred", "scores": [{"score": 75.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "open62541", "vendor": "open62541"}], "created": "2026-08-04T22:30:05.155509+00:00", "updated": "2026-08-05T16:30:13.005534+00:00", "vendors": ["open62541", "open62541$PRODUCT$open62541"]}