Denial of Service Vulnerability Reported in.NET 8, 9, 10
An early warning has been issued regarding a denial of service vulnerability that reportedly affects.NET 8,.NET 9, and.NET 10. The vulnerability, tracked as CVE-2026-50524 and GHSA-W7CW-XP7H-6J5J, appears to allow an attacker to crash or render unresponsive applications processing TLS handshakes.
What happened
According to the Microsoft Security Advisory, a denial of service vulnerability exists in.NET 8,.NET 9, and.NET 10 when handling TLS handshakes. An attacker can reportedly send a malformed request to exploit this vulnerability, causing the application to crash or become unresponsive. The affected components include various.NET runtime packages for Linux ARM, ARM64, and x64 architectures, specifically versions >=10.0.0 and <=10.0.9.
The vulnerability is under investigation, and the recommended action is to upgrade to patched versions of the affected packages. Professional software engineers should review their dependencies and assess whether their applications are utilizing any of the vulnerable.NET runtime packages. Further details can be found in the Microsoft Security Advisory CVE-2026-50524 –.NET Denial of Service Vulnerability.
How 0Day mitigates this
microsoft.netcore.app.runtime.linux-arm is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.