Heap-based buffer overflow in Microsoft Edge - CVE-2026-56645
Published: July 15, 2026
Vulnerability identifier: #VU137808
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-56645
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Edge
Microsoft Edge
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in Microsoft Edge (Chromium-based) when rendering crafted web content. A remote attacker can trick the victim into visiting a specially crafted website or opening a specially crafted URL to execute arbitrary code.
User interaction is required for exploitation.
How to mitigate CVE-2026-56645
Install security update from vendor's website.