Deadlock in Visual Studio and ASP.NET Core - CVE-2026-70186
Published: October 14, 2026
Vulnerability identifier: #VU154627
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70186
CWE-ID: CWE-833
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a deadlock in ASP.NET Core when accessed over a network. A remote attacker can trigger the deadlock to cause a denial of service.
Affected software
Visual Studio
ASP.NET Core
ASP.NET Core
How to mitigate CVE-2026-70186
Install security update from vendor's website.
Visual Studio - update to 17.14.42
ASP.NET Core - addressed in versions 8.0.32, 9.0.21
ASP.NET Core - addressed in versions 8.0.32, 9.0.21