Buffer over-read in Windows Server - CVE-2026-83684
Published: November 11, 2026
Vulnerability identifier: #VU165536
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83684
CWE-ID: CWE-126
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose heap memory from a privileged process running on the server.
The vulnerability exists due to a buffer over-read in Windows iSCSI Target Service when handling network input. A remote attacker can send specially crafted input to cause reads beyond a buffer boundary and disclose sensitive information from process memory.
Affected software
Windows Server
How to mitigate CVE-2026-83684
Install security update from vendor's website.
Windows Server - addressed in versions 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822