Protection mechanism failure in Windows and Windows Server - CVE-2026-34348
Published: July 17, 2026
Vulnerability identifier: #VU137957
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34348
CWE-ID: CWE-693
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 user to disclose sensitive information.
The vulnerability exists due to protection mechanism failure in Windows Event Logging Service when handling network requests. A remote user can send crafted requests to disclose sensitive information.
The disclosed information is limited to small portions of heap memory.
How to mitigate CVE-2026-34348
Install security update from vendor's website.