HTTP Request Smuggling Affecting microsoft.aspnetcore.server.kestrel.core package, versions [2.3.0, 2.3.6)
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Test your applications- Snyk IDSNYK-DOTNET-MICROSOFTASPNETCORESERVERKESTRELCORE-13551956
- published15 Oct 2025
- disclosed14 Oct 2025
- creditSid
Introduced: 14 Oct 2025
NewCVE-2025-55315 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade Microsoft.AspNetCore.Server.Kestrel.Core to version 2.3.6 or higher.
Overview
Microsoft.AspNetCore.Server.Kestrel.Core is a core components of ASP.NET Core Kestrel cross-platform web server.
Affected versions of this package are vulnerable to HTTP Request Smuggling via the interpretation of chunked HTTP requests. An attacker can bypass security restrictions and potentially access or manipulate sensitive data by sending specially crafted HTTP requests that exploit inconsistencies in request parsing.