{"id":"CVE-2026-97758","published":"2026-10-13T19:22:13.490","lastModified":"2026-10-15T21:19:29.887","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-122"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024","office online server"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97758","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A heap-based buffer overflow in Microsoft Excel allows remote attackers to execute arbitrary code when processing maliciously crafted Excel files. This vulnerability could be exploited by an unauthenticated attacker over a network without requiring user interaction.","exploitability":"Exploitation is moderately difficult as it requires crafting a specific malicious Excel file and convincing a target to open it, but the attack surface is large due to widespread Excel usage and lack of exploit code availability.","blast_radius":"The vulnerability affects multiple Microsoft 365 applications and Office versions, potentially enabling attackers to compromise a large number of endpoints across organizations that use these applications.","remediation":"Deploy the Microsoft Security Update KB5049127 for Excel 2021 and Office 2024, or upgrade to Microsoft 365 Apps for enterprise version 2408 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","excel","remote","buffer-overflow"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:21:15.739Z"}}