Microsoft Windows up to 2025 DNS Server path traversal

Summaryinfo

A vulnerability was found in Microsoft Windows up to 2025. It has been rated as very critical. Impacted is an unknown function of the component DNS Server. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-50426. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Microsoft Windows up to 2025. It has been classified as very critical. This affects an unknown function of the component DNS Server. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Relative path traversal in DNS Server allows an authorized attacker to execute code over an adjacent network.

It is possible to read the advisory at msrc.microsoft.com. This vulnerability is uniquely identified as CVE-2026-50426 since 06/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 07/14/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

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 1607
• 10 1809
• 2012
• 2012 R2
• 2016
• 2019
• 2022
• 2025

License

• commercial

Website

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

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