{"api_version":"1","generated_at":"2026-07-17T12:19:42+00:00","cve":"CVE-2026-55011","urls":{"html":"https://cve.report/CVE-2026-55011","api":"https://cve.report/api/cve/CVE-2026-55011.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-55011","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55011"},"summary":{"title":"Microsoft Defender Remote Code Execution Vulnerability","description":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","state":"PUBLISHED","assigner":"microsoft","published_at":"2026-07-14 17:17:08","updated_at":"2026-07-15 05:17:10"},"problem_types":["CWE-191","CWE-191 CWE-191: Integer Underflow (Wrap or Wraparound)"],"metrics":[{"version":"3.1","source":"secure@microsoft.com","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","version":"3.1"}}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55011","name":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55011","refsource":"secure@microsoft.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55011","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55011","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Microsoft","product":"Microsoft Malware Protection Engine","version":"affected 1.1.0.0 1.1.26060.3008 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"55011","cve":"CVE-2026-55011","epss":"0.004230000","percentile":"0.343420000","score_date":"2026-07-16","updated_at":"2026-07-17 00:05:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-55011","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-07-13T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-07-15T03:58:49.095Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"Microsoft Malware Protection Engine","vendor":"Microsoft","versions":[{"lessThan":"1.1.26060.3008","status":"affected","version":"1.1.0.0","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*","versionEndExcluding":"1.1.26060.3008","versionStartIncluding":"1.1.0.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"datePublic":"2026-07-14T14:00:00.000Z","descriptions":[{"lang":"en-US","value":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","lang":"en-US","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-14T19:37:09.825Z","orgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","shortName":"microsoft"},"references":[{"name":"Microsoft Defender Remote Code Execution Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55011"}],"title":"Microsoft Defender Remote Code Execution Vulnerability"}},"cveMetadata":{"assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","assignerShortName":"microsoft","cveId":"CVE-2026-55011","datePublished":"2026-07-14T17:05:03.262Z","dateReserved":"2026-06-16T14:12:44.283Z","dateUpdated":"2026-07-15T03:58:49.095Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-14 17:17:08","lastModifiedDate":"2026-07-15 05:17:10","problem_types":["CWE-191","CWE-191 CWE-191: Integer Underflow (Wrap or Wraparound)"],"metrics":{"cvssMetricV31":[{"source":"secure@microsoft.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-13T00:00:00+00:00","id":"CVE-2026-55011","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"55011","Ordinal":"1","Title":"Microsoft Defender Remote Code Execution Vulnerability","CVE":"CVE-2026-55011","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"55011","Ordinal":"1","NoteData":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","Type":"Description","Title":"Microsoft Defender Remote Code Execution Vulnerability"}]}}}