{"id":"CVE-2026-45584","title":"Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.","summary":"Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-122"],"vendor":"microsoft","product":"malware_protection_engine","affected":["malware_protection_engine >= 1.1.26030.3008, < 1.1.26040.8"],"patched":["malware_protection_engine 1.1.26040.8"],"published":"2026-05-20","updated":"2026-07-23","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45584","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584","label":"secure@microsoft.com"}],"tags":["nvd","exploit-available"],"epss":0.00707,"epssPercentile":0.51364,"ingestedAt":"2026-07-23T12:17:54.861Z","exploits":{"github":1,"githubRepos":["https://github.com/96613686/CVE-2026-45584"],"checkedAt":"2026-09-25T08:20:58.190Z"},"exploitAvailable":true,"slug":"CVE-2026-45584","body":"## Overview\n\nHeap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.\n\n## Affected\n\n- `malware_protection_engine >= 1.1.26030.3008, < 1.1.26040.8`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `malware_protection_engine 1.1.26040.8`","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":5241,"id":"CVE-2026-45584","ts":1788887256076,"field":"exploit_available","old":"false","new":"true"},{"seq":4124,"id":"CVE-2026-45584","ts":1788886372494,"field":"exploit_available","old":"true","new":"false"},{"seq":2897,"id":"CVE-2026-45584","ts":1788883037933,"field":"exploit_available","old":"false","new":"true"},{"seq":1926,"id":"CVE-2026-45584","ts":1788882441396,"field":"exploit_available","old":"true","new":"false"},{"seq":1015,"id":"CVE-2026-45584","ts":1788881876266,"field":"exploit_available","old":"false","new":"true"}]}