CVE-2026-59131: AMD Zen Information Disclosure Vulnerability

Overview

Severity

Medium (CVSS 5.6)

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Information Disclosure

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Aug

Released

2026-08-11

Description

No cwe for this issue in AMD Zen allows an authorized attacker to disclose information locally.

FAQ

What type of information could be disclosed by this vulnerability If the attacker has both the ability to modify the encrypted secret where it is stored and to observe the precise timing for the secret being decrypted by the application, the attacker could infer the original secret across many decryption attempts. According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability To exploit this vulnerability, an attacker would need to target an application by persisting encrypted secrets that are using specific old cryptography and Windows APIs.

Affected Products (28)

Windows

• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows Server 2025
• Windows 11 version 26H1 for x64-based Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (12)

• 5120238
• 5120242
• 5120229
• 5120249
• 5120233
• 5120228
• 5121003
• 5120994
• 5120240
• 5121000
• 5120418
• 5120386

Acknowledgments

Michael Monwuba with Microsoft

Revision History

• 2026-08-11: Information published.