{"id":"CVE-2026-70291","published":"2026-10-13T19:19:48.817","lastModified":"2026-10-15T21:17:46.443","description":"Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-122"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70291","tags":["Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A heap-based buffer overflow in Microsoft Outlook allows remote attackers to execute arbitrary code on vulnerable systems. This critical vulnerability can be exploited over a network without authentication, making it particularly dangerous for enterprise environments where Outlook is widely used.","exploitability":"Exploitation is relatively straightforward as it requires only a network connection and no user interaction or authentication, though successful exploitation depends on the attacker being able to deliver a specially crafted email or file that triggers the buffer overflow during processing.","blast_radius":"The impact could be severe across an organization since Outlook is commonly used for email communication, potentially allowing attackers to compromise multiple user accounts and establish persistent access through a single vulnerable installation.","remediation":"Deploy Microsoft Security Update KB5042819 immediately as it addresses this specific buffer overflow vulnerability in Outlook.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","email","outlook","network"],"model":"garnet-coder","analyzedAt":"2026-10-14T08:48:46.440Z"}}