ALAS2023-2026-2048

Amazon Linux 2023 Security Advisory: ALAS2023-2026-2048
Advisory Released Date: 2026-08-17
Advisory Updated Date: 2026-08-17
Severity: Important
Issue Overview:

Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network. (CVE-2026-47303)

Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a security feature over a network. (CVE-2026-47304)

Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to deny service over a network. (CVE-2026-50524)

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to perform tampering locally. (CVE-2026-50526)

Stack-based buffer overflow in .NET Framework allows an unauthorized attacker to deny service over a network. (CVE-2026-50527)

Allocation of resources without limits or throttling in .NET Framework allows an unauthorized attacker to deny service over a network. (CVE-2026-50648)

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally. (CVE-2026-50649)

Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny service over a network. (CVE-2026-50651)

Access of resource using incompatible type ('type confusion') in .NET Core allows an unauthorized attacker to deny service over a network. (CVE-2026-57108)


Affected Packages:

dotnet9.0


Issue Correction:
Run dnf update dotnet9.0 --releasever 2023.12.20260817 or dnf update --advisory ALAS2023-2026-2048 --releasever 2023.12.20260817 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:
aarch64:
    aspnetcore-runtime-dbg-9.0-9.0.18-1.amzn2023.0.1.aarch64
    netstandard-targeting-pack-2.1-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-hostfxr-9.0-debuginfo-9.0.18-1.amzn2023.0.1.aarch64
    aspnetcore-targeting-pack-9.0-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-sdk-9.0-source-built-artifacts-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-runtime-9.0-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-sdk-dbg-9.0-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-sdk-9.0-debuginfo-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-runtime-9.0-debuginfo-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-runtime-dbg-9.0-9.0.18-1.amzn2023.0.1.aarch64
    aspnetcore-runtime-9.0-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-sdk-aot-9.0-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-apphost-pack-9.0-debuginfo-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-host-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-hostfxr-9.0-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-targeting-pack-9.0-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-host-debuginfo-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-apphost-pack-9.0-9.0.18-1.amzn2023.0.1.aarch64
    dotnet-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-templates-9.0-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-sdk-aot-9.0-debuginfo-9.0.119-1.amzn2023.0.1.aarch64
    dotnet9.0-debugsource-9.0.119-1.amzn2023.0.1.aarch64
    dotnet-sdk-9.0-9.0.119-1.amzn2023.0.1.aarch64

src:
    dotnet9.0-9.0.119-1.amzn2023.0.1.src

x86_64:
    aspnetcore-runtime-9.0-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-runtime-9.0-debuginfo-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-sdk-aot-9.0-debuginfo-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-hostfxr-9.0-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-runtime-dbg-9.0-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-sdk-aot-9.0-9.0.119-1.amzn2023.0.1.x86_64
    dotnet9.0-debugsource-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-sdk-9.0-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-host-debuginfo-9.0.18-1.amzn2023.0.1.x86_64
    netstandard-targeting-pack-2.1-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-sdk-9.0-source-built-artifacts-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-9.0.119-1.amzn2023.0.1.x86_64
    aspnetcore-targeting-pack-9.0-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-host-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-sdk-9.0-debuginfo-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-apphost-pack-9.0-debuginfo-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-templates-9.0-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-apphost-pack-9.0-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-hostfxr-9.0-debuginfo-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-runtime-9.0-9.0.18-1.amzn2023.0.1.x86_64
    aspnetcore-runtime-dbg-9.0-9.0.18-1.amzn2023.0.1.x86_64
    dotnet-sdk-dbg-9.0-9.0.119-1.amzn2023.0.1.x86_64
    dotnet-targeting-pack-9.0-9.0.18-1.amzn2023.0.1.x86_64

Additional References

Release Notes:  Amazon Linux 2023 Release Notes

Red Hat: CVE-2026-47303, CVE-2026-47304, CVE-2026-50524, CVE-2026-50526, CVE-2026-50527, CVE-2026-50648, CVE-2026-50649, CVE-2026-50651, CVE-2026-57108

Mitre: CVE-2026-47303, CVE-2026-47304, CVE-2026-50524, CVE-2026-50526, CVE-2026-50527, CVE-2026-50648, CVE-2026-50649, CVE-2026-50651, CVE-2026-57108