Summary
.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.
Fixed packages 12
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | aspnetcore-runtime-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | aspnetcore-runtime-dbg-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | aspnetcore-targeting-pack-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | dotnet-apphost-pack-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | dotnet-hostfxr-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | dotnet-runtime-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | dotnet-runtime-dbg-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | dotnet-sdk-8.0 | 8.0.121-1.el9_6 |
| AlmaLinux · 9 | dotnet-sdk-8.0-source-built-artifacts | 8.0.121-1.el9_6 |
| AlmaLinux · 9 | dotnet-sdk-dbg-8.0 | 8.0.121-1.el9_6 |
| AlmaLinux · 9 | dotnet-targeting-pack-8.0 | 8.0.21-1.el9_6 |
| AlmaLinux · 9 | dotnet-templates-8.0 | 8.0.121-1.el9_6 |
Vulnerabilities 3
-
Critical 9.9
ASP.NET Security Feature Bypass Vulnerability
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.
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High 7.3
.NET Elevation of Privilege Vulnerability
Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.
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Medium 4.8
.NET, .NET Framework, and Visual Studio Information Disclosure Vulnerability
Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.
References
-
report
https://access.redhat.com/security/cve/CVE-2025-55247
-
report
https://access.redhat.com/security/cve/CVE-2025-55248
-
report
https://access.redhat.com/security/cve/CVE-2025-55315
-
report
https://bugzilla.redhat.com/2403083
-
report
https://bugzilla.redhat.com/2403085
-
report
https://bugzilla.redhat.com/2403086
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advisory
https://errata.almalinux.org/9/ALSA-2025-18149.html