CVE-2026-67858

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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": "Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service."}], "id": "CVE-2026-67858", "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-2026-67858", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T14:32:31.553656Z", "version": "2.0.3"}}]}, "published": "2026-08-04T22:17:16.087", "references": [{"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/master/doc/building.rst"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/issues/8094"}, {"source": "cve@mitre.org", "url": "https://github.com/open62541/open62541/tree/master/examples/discovery"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/open62541/open62541/issues/8094"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "open62541: open62541: Denial of Service via buffer overflow in Local Discovery Server", "id": "2511270", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511270"}, "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-120", "details": ["A flaw was found in open62541. When the Local Discovery Server (LDS) is configured with multicast discovery via the MDNSD backend, an unauthenticated remote attacker can exploit a buffer overflow vulnerability. By sending numerous unique discovery URLs in RegisterServer or RegisterServer2 requests, the attacker can cause the server to crash, leading to a denial of service."], "name": "CVE-2026-67858", "public_date": "2026-08-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67858\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67858\nhttps://github.com/open62541/open62541/blob/master/doc/building.rst\nhttps://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c\nhttps://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c\nhttps://github.com/open62541/open62541/issues/8094\nhttps://github.com/open62541/open62541/tree/master/examples/discovery"], "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": "2026-08-04T22:30:05.003341+00:00", "title": "Buffer Overflow in Multicast Discovery of open62541 1.5.5 Enables Remote DoS", "updated": "2026-08-04T22:30:05.154162+00:00", "vendors": ["open62541", "open62541$PRODUCT$open62541"], "weaknesses": ["CWE-120", "CWE-787"]}