{"id":"CVE-2026-55011","aliases":["EUVD-2026-44029","GHSA-9gvv-f74q-gxrr"],"status":"published","title":"Microsoft Defender Remote Code Execution Vulnerability","description":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","severity":{"version":"3.1","score":7.8,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00466,"percentile":0.4083,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-191"],"published":"2026-07-14T17:05:03Z","modified":"2026-11-10T22:35:35Z","products":[{"vendor":"microsoft","product":"malware_protection_engine"},{"vendor":"microsoft","product":"microsoft malware protection engine"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55011","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55011"},{"url":"https://github.com/advisories/GHSA-9gvv-f74q-gxrr"}],"sources":{"cve":[{"id":"CVE-2026-55011","title":"Microsoft Defender Remote Code Execution Vulnerability","description":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-07-14T17:05:03.262Z","modified":"2026-11-10T22:35:35.605Z","cvss":[{"version":"3.1","score":7.8,"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","level":"high","assessor":"cna"}],"cwes":["CWE-191"],"updated_at":"2026-11-10T23:49:29.024872Z"}],"euvd":[{"id":"EUVD-2026-44029","description":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-07-14T17:05:03Z","modified":"2026-11-10T22:35:35Z","cvss":[{"version":"3.1","score":7.8,"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","level":"high"}],"updated_at":"2026-11-10T23:24:15.503335Z"}],"ghsa":[{"id":"GHSA-9gvv-f74q-gxrr","title":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to...","description":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-07-14T18:32:10Z","modified":"2026-07-14T18:32:10Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T15:09:28.277582Z"}],"nvd":[{"id":"CVE-2026-55011","description":"Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-07-14T17:17:08.99Z","modified":"2026-10-24T21:10:00.13Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}