Inconsistent interpretation of HTTP requests in Visual Studio and ASP.NET Core - CVE-2026-88092
Published: October 14, 2026
Vulnerability identifier: #VU155297
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88092
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to tamper with server-side HTTP request handling.
The vulnerability exists due to inconsistent interpretation of HTTP requests in ASP.NET Core when processing HTTP/1.1 requests forwarded through a reverse proxy. A remote attacker can send specially crafted requests that desynchronize request handling between the proxy and the server and inject an unintended request to tamper with server-side HTTP request handling.
User interaction is not required.
Affected software
Visual Studio
ASP.NET Core
ASP.NET Core
How to mitigate CVE-2026-88092
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