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A vulnerability marked as critical has been reported in Microsoft Visual Studio. Affected by this vulnerability is an unknown functionality. Performing a manipulation results in command injection. This vulnerability is cataloged as CVE-2026-21256. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to apply a patch to fix this issue.

A vulnerability, which was classified as critical, was found in Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2025. This affects an unknown part of the component Kernel. The manipulation results in heap-based buffer overflow. This vulnerability is known as CVE-2026-21245. Attacking locally is a requirement. No exploit is available. It is best practice to apply a patch to resolve this issue.

A vulnerability labeled as critical has been found in Microsoft Windows. Affected is an unknown function of the component Hyper-V. Such manipulation leads to improper access controls. This vulnerability is listed as CVE-2026-21255. The attack must be carried out locally. There is no available exploit. It is best practice to apply a patch to resolve this issue.

A vulnerability, which was classified as critical, has been found in Microsoft Windows. Affected by this issue is some unknown functionality of the component Hyper-V. The manipulation leads to heap-based buffer overflow. This vulnerability is traded as CVE-2026-21244. An attack has to be approached locally. There is no exploit available. Applying a patch is the recommended action to fix this issue.

A vulnerability identified as critical has been detected in Microsoft Windows. This impacts an unknown function of the component Mailslot File System. This manipulation causes use after free. This vulnerability is tracked as CVE-2026-21253. The attack is restricted to local execution. No exploit exists. Applying a patch is the recommended action to fix this issue.

A vulnerability classified as critical was found in Microsoft Windows Server 2019/Server 2022/Server 2022 23H2/Server 2025. Affected by this vulnerability is an unknown functionality of the component Lightweight Directory Access Protocol. Executing a manipulation can lead to null pointer dereference. This vulnerability appears as CVE-2026-21243. The attack may be performed from remote. There is no available exploit. It is advisable to implement a patch to correct this issue.

A vulnerability categorized as critical has been discovered in Microsoft Windows Server 2016/Server 2019/Server 2022/Server 2022 23H2/Server 2025. This affects an unknown function of the component Cluster Client Failover. The manipulation results in use after free. This vulnerability is identified as CVE-2026-21251. The attack is only possible with local access. There is not any exploit available. It is advisable to implement a patch to correct this issue.

A vulnerability classified as critical has been found in Microsoft Windows up to Server 2025. Affected is an unknown function of the component Subsystem for Linux. Performing a manipulation results in use after free. This vulnerability is reported as CVE-2026-21242. The attack requires a local approach. No exploit exists. To fix this issue, it is recommended to deploy a patch.

A vulnerability was found in Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2022 23H2/Server 2025. It has been rated as critical. The impacted element is an unknown function in the library HTTP.sys. The manipulation leads to untrusted pointer dereference. This vulnerability is referenced as CVE-2026-21250. The attack can only be performed from a local environment. No exploit is available. To fix this issue, it is recommended to deploy a patch.

A vulnerability described as critical has been identified in Microsoft Windows up to Server 2025. This impacts an unknown function of the component Ancillary Function Driver for WinSock. Such manipulation leads to use after free. This vulnerability is documented as CVE-2026-21241. The attack needs to be performed locally. There is not any exploit available. A patch should be applied to remediate this issue.

A vulnerability was found in Microsoft Windows. It has been declared as problematic. The affected element is an unknown function of the component NTLM. Executing a manipulation can lead to file inclusion. The identification of this vulnerability is CVE-2026-21249. The attack can only be executed locally. There is no exploit available. A patch should be applied to remediate this issue.

A vulnerability was found in Microsoft Windows. It has been classified as critical. Impacted is an unknown function of the component Hyper-V. Performing a manipulation results in heap-based buffer overflow. This vulnerability was named CVE-2026-21248. The attack needs to be approached locally. There is no available exploit. It is suggested to install a patch to address this issue.

A vulnerability labeled as critical has been found in Microsoft Windows. The impacted element is an unknown function of the component Kernel. The manipulation results in heap-based buffer overflow. This vulnerability is cataloged as CVE-2026-21239. The attack must be initiated from a local position. There is no exploit available. Applying a patch is advised to resolve this issue.

A vulnerability identified as critical has been detected in Microsoft Windows. The affected element is an unknown function of the component Ancillary Function Driver for WinSock. The manipulation leads to improper access controls. This vulnerability is listed as CVE-2026-21238. The attack must be carried out locally. There is no available exploit. It is recommended to apply a patch to fix this issue.

A vulnerability was found in Microsoft Windows and classified as critical. This issue affects some unknown processing of the component Hyper-V. Such manipulation leads to heap-based buffer overflow. This vulnerability is uniquely identified as CVE-2026-21247. Local access is required to approach this attack. No exploit exists. Applying a patch is advised to resolve this issue.

A vulnerability categorized as critical has been discovered in Microsoft Windows up to Server 2025. Impacted is an unknown function of the component Subsystem for Linux. Executing a manipulation can lead to race condition. This vulnerability is tracked as CVE-2026-21237. The attack is restricted to local execution. No exploit exists. It is best practice to apply a patch to resolve this issue.

A vulnerability has been found in Microsoft Windows and classified as critical. This vulnerability affects unknown code of the component Graphics. This manipulation causes heap-based buffer overflow. This vulnerability is handled as CVE-2026-21246. It is possible to launch the attack on the local host. There is not any exploit available. It is recommended to apply a patch to fix this issue.

A vulnerability was found in Microsoft Windows. It has been rated as critical. This issue affects some unknown processing of the component Ancillary Function Driver for WinSock. Performing a manipulation results in heap-based buffer overflow. This vulnerability is identified as CVE-2026-21236. The attack is only possible with local access. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

A vulnerability was found in Microsoft Windows. It has been declared as critical. This vulnerability affects unknown code of the component Graphics. Such manipulation leads to use after free. This vulnerability is referenced as CVE-2026-21235. The attack can only be performed from a local environment. No exploit is available. It is advisable to implement a patch to correct this issue.

A vulnerability was found in Microsoft Windows. It has been classified as critical. This affects an unknown part of the component Connected Devices Platform Service. This manipulation causes race condition. The identification of this vulnerability is CVE-2026-21234. The attack can only be executed locally. There is no exploit available. To fix this issue, it is recommended to deploy a patch.