- Severity: MEDIUM
- CVE: CVE-2026-114154
- Ecosystems: nuget, nuget, nuget, nuget, nuget, nuget, nuget, nuget, nuget, nuget, nuget, nuget, nuget
- Packages: Microsoft.AspNetCore.Server.HttpSys, Microsoft.AspNetCore.Server.HttpSys, Microsoft.AspNetCore.Server.HttpSys, Microsoft.AspNetCore.Server.HttpSys, Microsoft.AspNetCore.App.Runtime.win-arm64, Microsoft.AspNetCore.App.Runtime.win-x64, Microsoft.AspNetCore.App.Runtime.win-x86, Microsoft.AspNetCore.App.Runtime.win-arm64, Microsoft.AspNetCore.App.Runtime.win-x64, Microsoft.AspNetCore.App.Runtime.win-x86, Microsoft.AspNetCore.App.Runtime.win-arm64, Microsoft.AspNetCore.App.Runtime.win-x64, Microsoft.AspNetCore.App.Runtime.win-x86
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core. This advisory provides guidance on updating affected applications and components.
Malformed chunked HttpSys requests containing conflicting content-length headers can retain request and connection resources.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/513
## CVSS Details
– **Version:** 3.1
– **Severity:** High
– **Score:** 7.5 (base score)
– **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C`
– **Weakness:** CWE-401
## Affected Platforms
– **Platforms:** Windows
– **Architectures:** All
## Affected Packages
The tables list affected version ranges and fixed package versions. Runtime and standalone deliveries are listed separately.
### ASP.NET Core 2.3 – standalone packages
Package | Affected version | Patched version
— | — | —
[Microsoft.AspNetCore.Server.HttpSys](https://www.nuget.org/packages/Microsoft.AspNetCore.Server.HttpSys) | = 2.3.10 | 2.3.14
[Microsoft.AspNetCore.Server.HttpSys](https://www.nuget.org/packages/Microsoft.AspNetCore.Server.HttpSys) | = 2.3.11 | 2.3.14
[Microsoft.AspNetCore.Server.HttpSys](https://www.nuget.org/packages/Microsoft.AspNetCore.Server.HttpSys) | = 2.3.12 | 2.3.14
[Microsoft.AspNetCore.Server.HttpSys](https://www.nuget.org/packages/Microsoft.AspNetCore.Server.HttpSys) | = 2.3.13 | 2.3.14
### .NET 8.0 – affected runt…
Source: GitHub Security Advisories · 2026-11-11