Observable discrepancy in Microsoft Windows and Windows Server - CVE-2026-59130
Published: August 12, 2026
Vulnerability identifier: #VU141741
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59130
CWE-ID: CWE-203
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to a side-channel weakness in AMD Zen when decrypting persisted encrypted secrets using specific old cryptography and Windows APIs. A local user can modify an encrypted secret and observe precise decryption timing across many attempts to disclose sensitive information.
Exploitation requires targeting an application that persists encrypted secrets and relies on specific old cryptography and Windows APIs.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-59130
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7663, 10 22H2 10.0.19045.7663, 10 1607 10.0.14393.9418, 10 1809 10.0.17763.9115, 11 23H2 10.0.22631.7517, 11 24H2 10.0.26100.9106, 11 24H2 10.0.26100.9168, 11 25H2 10.0.26200.9168, 11 26H1 10.0.28000.2704
Windows Server - addressed in versions 2012 R2 6.3.9600.23337, 2016 10.0.14393.9418, 2019 10.0.17763.9115, 2022 10.0.20348.5440, 2022 10.0.20348.5499, 2025 10.0.26100.33222, 2025 10.0.26100.33296
Windows Server - addressed in versions 2012 R2 6.3.9600.23337, 2016 10.0.14393.9418, 2019 10.0.17763.9115, 2022 10.0.20348.5440, 2022 10.0.20348.5499, 2025 10.0.26100.33222, 2025 10.0.26100.33296