Microsoft Windows up to Server 2025 Active Directory Domain Services heap-based overflow

Summaryinfo

A vulnerability, which was classified as very critical, was found in Microsoft Windows. Affected by this vulnerability is an unknown functionality of the component Active Directory Domain Services. Such manipulation leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2026-49178. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Microsoft Windows. It has been rated as very critical. Affected by this issue is some unknown functionality of the component Active Directory Domain Services. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

Heap-based buffer overflow in Active Directory Domain Services allows an authorized attacker to execute code over a network.

The advisory is available at msrc.microsoft.com. This vulnerability is handled as CVE-2026-49178 since 05/28/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $25k-$100k at the moment (estimation calculated on 07/14/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 10 21H2
• 10 22H2
• 10 1607
• 10 1809
• 11 24H2
• 11 25H2
• 11 26H1
• Server 2012
• Server 2012 R2
• Server 2016
• Server 2019
• Server 2022
• Server 2025

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

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