Is CVE-2026-49178 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-49178 being exploited in the wild.

How severe is CVE-2026-49178?

High severity, with a CVSS score of 8.8, 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-2026-49178?

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-2026-49178 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-49178?

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.

CVE-2026-49178: Microsoft Active Directory Domain Services heap overflow

CVE-2026-49178 · Severity: high · CVSS 8.8 · Published 2026-07-14

A security 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 with basic user credentials could exploit this flaw to take control of the domain controller or disrupt network operations. This could lead to a total compromise of the organization's identity management system and unauthorized access to sensitive data.

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

Quick answers

Is CVE-2026-49178 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-49178 being exploited in the wild.
How severe is CVE-2026-49178?: High severity, with a CVSS score of 8.8, 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-2026-49178?: 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-2026-49178 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-49178?: 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 within Microsoft Active Directory Domain Services (AD DS). The vulnerability is reachable over the network and requires low-privileged authentication (PR:L). By sending specially crafted requests to an affected domain controller, an attacker can trigger the overflow to achieve remote code execution (RCE) in the context of the service. This affects multiple versions of Windows and Windows Server, including Windows 10, Windows 11, and Windows Server 2012. Microsoft has released security updates to address this issue.

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

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49178

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