CVE-2026-55011

{"id": "CVE-2026-55011", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55011", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-13T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft Malware Protection Engine", "versions": [{"status": "affected", "version": "1.1.0.0", "lessThan": "1.1.26060.3008", "versionType": "custom"}]}]}], "published": "2026-07-14T17:17:08.990", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55011", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-191"}]}], "descriptions": [{"lang": "en", "value": "Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally."}], "lastModified": "2026-07-24T19:19:48.540", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "68C13D1D-69E8-431B-B716-B307ED19733C", "versionEndExcluding": "1.1.26060.3008"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}