Heap-based buffer overflow in Windows and Windows Server - CVE-2026-54122
Published: July 17, 2026
Vulnerability identifier: #VU137944
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-54122
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in Windows GDI+ when processing crafted content delivered via a malicious link or email. A remote attacker can send a specially crafted email or malicious link to execute arbitrary code.
User interaction may be required in some attack scenarios, but the highest-risk scenario does not require the victim to open, read, or click the link.
How to mitigate CVE-2026-54122
Install security update from vendor's website.