Microsoft Windows up to Server 2025 RDP integer overflow

Summaryinfo

A vulnerability identified as very critical has been detected in Microsoft Windows. Impacted is an unknown function of the component RDP. Performing a manipulation results in integer overflow. This vulnerability was named CVE-2026-58594. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Microsoft Windows. It has been classified as very critical. This affects some unknown functionality of the component RDP. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow or wraparound in Windows RDP allows an unauthorized attacker to execute code over a network.

The advisory is shared at msrc.microsoft.com. This vulnerability is uniquely identified as CVE-2026-58594 since 07/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 07/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 326875 (KB5099538: Windows 10 version 1809 / Windows Server 2019 Security Update (July 2026)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (326875). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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