RHSA-2026:58567 - Security Advisory

Topic

An update for .NET 9.0 is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

.NET is a fast, lightweight and modular platform for creating cross platform applications that work on Linux, macOS and Windows. It particularly focuses on creating console applications, web applications and micro-services. .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK containing compilers and a 'dotnet' application to drive everything.

SDK version: 9.0.120
Runtime version: 9.0.19

Security Fix(es):

• dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM (CVE-2026-50651)
• dotnet: .NET Core: Denial of Service via type confusion (CVE-2026-57108)
• ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation (CVE-2026-56170)
• ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm (CVE-2026-47300)
• ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass (CVE-2026-47303)
• dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-47304)
• dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation (CVE-2026-47302)
• dotnet: .NET Framework: Privilege escalation via code injection (CVE-2026-50650)
• dotnet: .NET: Security feature bypass due to incorrect authorization (CVE-2026-50528)
• dotnet: .NET: Local code execution via deserialization of untrusted data (CVE-2026-50649)
• dotnet: .NET: Local tampering via improper link resolution (CVE-2026-50526)
• dotnet: .NET Framework: Local Code Execution via Protection Mechanism Failure (CVE-2026-50646)
• dotnet: .NET: Denial of Service due to uncontrolled resource allocation (CVE-2026-50525)
• dotnet: .NET Framework: Denial of Service via network-based buffer overflow (CVE-2026-50527)
• dotnet: .NET Framework: Remote Denial of Service due to uncontrolled resource allocation (CVE-2026-50648)
• .NET: .NET: Network Spoofing Vulnerability (CVE-2026-50659)
• dotnet: .NET Framework: Denial of Service via improper input validation (CVE-2026-50524)
• .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899)
• .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900)
• .NET: .NET Denial of Service Vulnerability (CVE-2026-62901)
• .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)

Bug Fix(es) and Enhancement(s):

• dotnet9.0: Reduce time to detect hanging builds during .NET RPM builds (c10s) [rhel-10.0.z] (JIRA:RHEL-192324)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64

Fixes

• BZ - 2499217 - CVE-2026-50651 dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM
• BZ - 2500109 - CVE-2026-57108 dotnet: .NET Core: Denial of Service via type confusion
• BZ - 2500189 - CVE-2026-56170 ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation
• BZ - 2500492 - CVE-2026-47300 ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm
• BZ - 2500502 - CVE-2026-47303 ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass
• BZ - 2500509 - CVE-2026-47304 dotnet: .NET Security Feature Bypass Vulnerability
• BZ - 2500515 - CVE-2026-47302 dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation
• BZ - 2500556 - CVE-2026-50650 dotnet: .NET Framework: Privilege escalation via code injection
• BZ - 2500562 - CVE-2026-50528 dotnet: .NET: Security feature bypass due to incorrect authorization
• BZ - 2500563 - CVE-2026-50649 dotnet: .NET: Local code execution via deserialization of untrusted data
• BZ - 2500565 - CVE-2026-50526 dotnet: .NET: Local tampering via improper link resolution
• BZ - 2500577 - CVE-2026-50646 dotnet: .NET Framework: Local Code Execution via Protection Mechanism Failure
• BZ - 2500580 - CVE-2026-50525 dotnet: .NET: Denial of Service due to uncontrolled resource allocation
• BZ - 2500581 - CVE-2026-50527 dotnet: .NET Framework: Denial of Service via network-based buffer overflow
• BZ - 2500587 - CVE-2026-50648 dotnet: .NET Framework: Remote Denial of Service due to uncontrolled resource allocation
• BZ - 2500589 - CVE-2026-50659 .NET: .NET: Network Spoofing Vulnerability
• BZ - 2500593 - CVE-2026-50524 dotnet: .NET Framework: Denial of Service via improper input validation
• BZ - 2512175 - CVE-2026-62899 .NET: .NET Core: .NET Security Feature Bypass Vulnerability
• BZ - 2512179 - CVE-2026-62900 .NET: .NET Information Disclosure Vulnerability
• BZ - 2512180 - CVE-2026-62901 .NET: .NET Denial of Service Vulnerability
• BZ - 2512185 - CVE-2026-62909 .NET: .NET Elevation of Privilege Vulnerability

CVEs

• CVE-2026-47300
• CVE-2026-47302
• CVE-2026-47303
• CVE-2026-47304
• CVE-2026-50524
• CVE-2026-50525
• CVE-2026-50526
• CVE-2026-50527
• CVE-2026-50528
• CVE-2026-50646
• CVE-2026-50648
• CVE-2026-50649
• CVE-2026-50650
• CVE-2026-50651
• CVE-2026-50659
• CVE-2026-56170
• CVE-2026-57108
• CVE-2026-62899
• CVE-2026-62900
• CVE-2026-62901
• CVE-2026-62909

References

• https://access.redhat.com/security/updates/classification/#important