Buffer over-read in Microsoft Edge - CVE-2026-66312
Published: July 31, 2026 / Updated: August 2, 2026
Vulnerability identifier: #VU140713
CSH Severity: Low
CVSS v4 BT: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2026-66312
CWE-ID: CWE-126
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to buffer over-read in Microsoft Edge (Chromium-based) when processing crafted web content. A remote user can cause the application to process crafted content to execute arbitrary code.
Affected software
Microsoft Edge
How to mitigate CVE-2026-66312
Install security update from vendor's website.
Microsoft Edge - update to 151.0.4129.59