CVE-2026-49164: Microsoft Active Directory Domain Services heap overflow

CVE-2026-49164 · Severity: high · CVSS 8.1 · Published 2026-07-14

A critical vulnerability has been identified in Microsoft Active Directory Domain Services, the core service used by organizations to manage users, computers, and network permissions. An attacker could exploit this flaw over the network to gain unauthorized control over the domain controller. This could lead to a total compromise of the corporate identity infrastructure, allowing for data theft or widespread service disruption.

Technologies: Microsoft Active Directory Domain Services, Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2012. Vendors: Microsoft.

Quick answers

Is CVE-2026-49164 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-49164 being exploited in the wild.
How severe is CVE-2026-49164?
High severity, with a CVSS score of 8.1, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All versions.
Is there a fix for CVE-2026-49164?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-49164 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-49164?
Check whether you run Microsoft Active Directory Domain Services, Microsoft Windows 11, Microsoft Windows 10 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow (CWE-122) exists in Microsoft Active Directory Domain Services (AD DS). The vulnerability is triggered when the service improperly handles specially crafted network requests, leading to memory corruption. An unauthenticated attacker can exploit this over the network to achieve remote code execution (RCE) in the context of the SYSTEM account. While the attack vector is network-based and requires no user interaction, the CVSS complexity is rated as High, suggesting specific timing or environmental conditions may be required for successful exploitation. Microsoft has released security updates to address this issue across affected Windows and Windows Server versions.

Affected products

  • Microsoft Windows 10 1607, 1809, 21H2, 22H2
  • Microsoft Windows 11 24H2, 25H2, 26H1
  • Microsoft Windows Server 2012 All versions
  • Microsoft Active Directory Domain Services

Timeline

  • 2026-07-14: disclosed
  • 2026-07-14: advisory

References

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