ALAS2027-2026-304

Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-304
Advisory Released Date: 2026-11-09
Advisory Updated Date: 2026-11-10
Severity: Important
Issue Overview:

Package updates are available for Amazon Linux 2027 that fix the following vulnerabilities:
CVE-2026-96960:
Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a network.

CVE-2026-96959:
Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny service over a network.

CVE-2026-96958:
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

CVE-2026-96957:
Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a security feature over a network.

CVE-2026-96238:
Origin validation error in .NET allows an unauthorized attacker to bypass a security feature over a network.

CVE-2026-96237:
Inclusion of functionality from untrusted control sphere in .NET allows an unauthorized attacker to execute code over a network.

CVE-2026-96236:
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-96233:
Out-of-bounds write in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-96231:
Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.

CVE-2026-96230:
Improper neutralization of input during web page generation ('cross-site scripting') in ASP.NET Core allows an unauthorized attacker to execute code over a network.

CVE-2026-96225:
Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.

CVE-2026-84008:
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

CVE-2026-83520:
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

CVE-2026-70197:
Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.

CVE-2026-70196:
Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-70186:
Deadlock in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-70183:
Concurrent execution using shared resource with improper synchronization ('race condition') in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

CVE-2026-70181:
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-70179:
Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

CVE-2026-70175:
Improper authentication in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

CVE-2026-70159:
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-70007:
Out-of-bounds write in .NET Framework allows an unauthorized attacker to execute code over a network.

CVE-2026-69651:
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

CVE-2026-66822:
Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information over a network.

CVE-2026-58280:
Uncontrolled recursion in .NET allows an unauthorized attacker to deny service over a network.

CVE-2026-114148:
Incorrect default permissions in ASP.NET Core allows an authorized attacker to elevate privileges locally.

CVE-2026-109468:
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVE-2026-102870:
Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.


Affected Packages:

dotnet10.0


Issue Correction:
Run dnf update dotnet10.0 --releasever 2027.0.20261109 or dnf update --advisory ALAS2027-2026-304 --releasever 2027.0.20261109 to update your system.

New Packages:
aarch64:
    dotnet-apphost-pack-10.0-debuginfo-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-hostfxr-10.0-debuginfo-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-apphost-pack-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-sdk-10.0-debuginfo-10.0.114-1.amzn2027.0.1.aarch64
    dotnet-sdk-10.0-source-built-artifacts-10.0.114-1.amzn2027.0.1.aarch64
    dotnet-targeting-pack-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-runtime-dbg-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-host-debuginfo-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-sdk-dbg-10.0-10.0.114-1.amzn2027.0.1.aarch64
    aspnetcore-runtime-dbg-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-host-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-runtime-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-10.0.114-1.amzn2027.0.1.aarch64
    aspnetcore-targeting-pack-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-templates-10.0-10.0.114-1.amzn2027.0.1.aarch64
    dotnet-hostfxr-10.0-10.0.14-1.amzn2027.0.1.aarch64
    aspnetcore-runtime-10.0-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-sdk-aot-10.0-debuginfo-10.0.114-1.amzn2027.0.1.aarch64
    dotnet-runtime-10.0-debuginfo-10.0.14-1.amzn2027.0.1.aarch64
    dotnet-sdk-aot-10.0-10.0.114-1.amzn2027.0.1.aarch64
    dotnet10.0-debugsource-10.0.114-1.amzn2027.0.1.aarch64
    dotnet-sdk-10.0-10.0.114-1.amzn2027.0.1.aarch64

src:
    dotnet10.0-10.0.114-1.amzn2027.0.1.src

x86_64:
    aspnetcore-runtime-dbg-10.0-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-host-debuginfo-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-hostfxr-10.0-debuginfo-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-runtime-dbg-10.0-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-sdk-dbg-10.0-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-apphost-pack-10.0-debuginfo-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-sdk-10.0-debuginfo-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-runtime-10.0-debuginfo-10.0.14-1.amzn2027.0.1.x86_64
    dotnet10.0-debugsource-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-host-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-hostfxr-10.0-10.0.14-1.amzn2027.0.1.x86_64
    aspnetcore-runtime-10.0-10.0.14-1.amzn2027.0.1.x86_64
    aspnetcore-targeting-pack-10.0-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-targeting-pack-10.0-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-templates-10.0-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-sdk-aot-10.0-debuginfo-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-apphost-pack-10.0-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-sdk-aot-10.0-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-runtime-10.0-10.0.14-1.amzn2027.0.1.x86_64
    dotnet-sdk-10.0-source-built-artifacts-10.0.114-1.amzn2027.0.1.x86_64
    dotnet-sdk-10.0-10.0.114-1.amzn2027.0.1.x86_64

Additional References

Red Hat: CVE-2026-58280, CVE-2026-70196, CVE-2026-70181, CVE-2026-96958, CVE-2026-96238, CVE-2026-69651, CVE-2026-96957, CVE-2026-70186, CVE-2026-114148, CVE-2026-102870, CVE-2026-83520, CVE-2026-96236, CVE-2026-96959, CVE-2026-96233, CVE-2026-70183, CVE-2026-70007, CVE-2026-96231, CVE-2026-70175, CVE-2026-109468, CVE-2026-96230, CVE-2026-70197, CVE-2026-66822, CVE-2026-70179, CVE-2026-70159, CVE-2026-96960, CVE-2026-96225, CVE-2026-96237, CVE-2026-84008

Mitre: CVE-2026-58280, CVE-2026-70196, CVE-2026-70181, CVE-2026-96958, CVE-2026-96238, CVE-2026-69651, CVE-2026-96957, CVE-2026-70186, CVE-2026-114148, CVE-2026-102870, CVE-2026-83520, CVE-2026-96236, CVE-2026-96959, CVE-2026-96233, CVE-2026-70183, CVE-2026-70007, CVE-2026-96231, CVE-2026-70175, CVE-2026-109468, CVE-2026-96230, CVE-2026-70197, CVE-2026-66822, CVE-2026-70179, CVE-2026-70159, CVE-2026-96960, CVE-2026-96225, CVE-2026-96237, CVE-2026-84008