Microsoft Security Advisory CVE-2026-114157 - ASP.NET Core Security Feature Bypass Vulnerability
CVE-2026-114157
Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core's Kestrel Named Pipes transport. This advisory provides guidance on updating affected applications and components. A Kestrel named-pipe listener configured with CurrentUserOnly can lose protected namespace ownership during recovery, allowing another local user to claim the pipe path. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/507 CVSS Details Version: 3.1 Severity: High Score: 7.5 (base score) Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C Weakness: CWE-362 MSRC severity: Important Impact: Security Feature Bypass Affected Platforms Platforms: Windows Architectures: Arm64, x64, x86 Affected Packages Microsoft.AspNetCore.Server.Kestrel.Transport.NamedPipes ships in the ASP.NET Core shared framework and runtime packs; it is not a separately packable NuGet package. Affected intervals and patched release versions are listed below. .NET 8.0 - affected runtime packages Package | Affected version | Patched version | --- | ---…
Assessment
- CVSS
- 6.5 (v3.1)
- Severity
- Medium
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 11 November 2026
- Last updated
- 11 November 2026
- Affected
- Microsoft.AspNetCore.App.Runtime.win-arm64 · Microsoft.AspNetCore.App.Runtime.win-x64 · Microsoft.AspNetCore.App.Runtime.win-x86
- Weakness
- CWE-362
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
At the source
References
- https://github.com/dotnet/aspnetcore/security/advisories/GHSA-7phj-vgxq-r67h
- https://github.com/dotnet/announcements/issues/507
- https://github.com/dotnet/aspnetcore/commit/671bb7f9c84e24153ac8440e4e6de307a6cbd920
- https://github.com/dotnet/aspnetcore/commit/a4ade6a6848f06681af1a57b5a7b555647d3e19d
- https://github.com/dotnet/aspnetcore/discussions/70472
- https://github.com/dotnet/aspnetcore/releases/tag/v10.0.15
- https://github.com/dotnet/aspnetcore/releases/tag/v11.0.0
- https://github.com/dotnet/aspnetcore/releases/tag/v8.0.34
- https://github.com/dotnet/aspnetcore/releases/tag/v9.0.23
- https://github.com/dotnet/core/blob/main/release-notes/10.0/10.0.15/10.0.15.md
- https://github.com/dotnet/core/blob/main/release-notes/11.0/11.0.0/11.0.0.md
- https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.34/8.0.34.md
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