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ALSA-2025:18148 — Important: .NET 8.0 security update

Affected: AlmaLinux:8: aspnetcore-runtime-8.0, AlmaLinux:8: aspnetcore-runtime-dbg-8.0, AlmaLinux:8: aspnetcore-targeting-pack-8.0, AlmaLinux:8: dotnet-apphost-pack-8.0, AlmaLinux:8: dotnet-hostfxr-8.0, AlmaLinux:8: dotnet-runtime-8.0, AlmaLinux:8: dotnet-runtime-dbg-8.0, AlmaLinux:8: dotnet-sdk-8.0, AlmaLinux:8: dotnet-sdk-8.0-source-built-artifacts, AlmaLinux:8: dotnet-sdk-dbg-8.0 and 2 more

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.121 and .NET Runtime 8.0.21.Security Fix(es):

* dotnet: .NET Information Disclosure Vulnerability (CVE-2025-55248) * dotnet: .NET Security Feature Bypass Vulnerability (CVE-2025-55315) * dotnet: .NET Denial of Service Vulnerability (CVE-2025-55247)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2025-13257

BELL-CVE-2025-55248

Affected: Alpaquita:25: dotnet8-runtime, Alpaquita:25: dotnet8-sdk, Alpaquita:stream: dotnet8-runtime, Alpaquita:stream: dotnet8-sdk

BIT-dotnet-2025-55248 — .NET, .NET Framework, and Visual Studio Information Disclosure Vulnerability

Affected: Bitnami: dotnet

Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.

certfr-2025-avi-0879 — De multiples vulnérabilités ont été découvertes dans Microsoft Windows. Certaines d'entre elles permettent à un attaqua…

certfr-2025-avi-0879

EUVD-2026-269146

fkie_cve-2025-55248

Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.

GHSA-gwq6-fmvp-qp68 — Microsoft Security Advisory CVE-2025-55248: .NET Information Disclosure Vulnerability

Affected: NuGet: Microsoft.NetCore.App.Runtime.linux-arm, NuGet: Microsoft.NetCore.App.Runtime.linux-arm64, NuGet: Microsoft.NetCore.App.Runtime.linux-musl-arm, NuGet: Microsoft.NetCore.App.Runtime.linux-musl-arm64, NuGet: Microsoft.NetCore.App.Runtime.linux-musl-x64, NuGet: Microsoft.NetCore.App.Runtime.linux-x64, NuGet: Microsoft.NetCore.App.Runtime.osx-arm64, NuGet: Microsoft.NetCore.App.Runtime.osx-x64, NuGet: Microsoft.NetCore.App.Runtime.win-arm, NuGet: Microsoft.NetCore.App.Runtime.win-arm64 and 2 more

# Microsoft Security Advisory CVE-2025-55248 | .NET Information Disclosure Vulnerability

## <a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0 and .NET 9.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A MITM (man in the middle) attacker may prevent use of TLS between client and SMTP server, forcing client to send data over unencrypted connection.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/372

## <a name="mitigation-factors"></a>Mitigation factors

Microsoft has not identified any mitigating factors for this vulnerability.

## <a name="affected-software"></a>Affected software

* Any .NET 8.0 application running on .NET 8.0.20 or earlier. * Any .NET 9.0 application running on .NET 9.0.9 or earlier.

## <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected packages versions listed below

### <a name=".NET 9"></a>.NET 9 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm) | >= 9.0.0, < =9.0.9 | 9.0.10 [Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Mi…

msrc_CVE-2025-55248 — .NET, .NET Framework, and Visual Studio Information Disclosure Vulnerability

msrc_CVE-2025-55248

RHSA-2025:18148 — Red Hat Security Advisory: .NET 8.0 security update

dotnet: .NET Denial of Service Vulnerability dotnet: .NET Information Disclosure Vulnerability dotnet: .NET Security Feature Bypass Vulnerability

RHSA-2025:18152 — Red Hat Security Advisory: .NET 8.0 security update

dotnet: .NET Denial of Service Vulnerability dotnet: .NET Information Disclosure Vulnerability dotnet: .NET Security Feature Bypass Vulnerability

UBUNTU-CVE-2025-55248

Affected: Ubuntu:22.04:LTS: dotnet6, Ubuntu:22.04:LTS: dotnet7, Ubuntu:22.04:LTS: dotnet8, Ubuntu:24.04:LTS: dotnet8, Ubuntu:25.10: dotnet8, Ubuntu:25.10: dotnet9

Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.

WID-SEC-W-2025-2278 — Microsoft Developer Tools: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Visual Studio, .NET Framework, Windows Server, ASP.NET, PowerShell und Windows ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um seine Privilegien zu erhöhen, und um Informationen offenzulegen.