ALAS2023-2026-1869: Security update for 22 packages

ALAS2023-2026-1869, released June 22, 2026, fixes 3 CVEs across 22 products. None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

7.8

Base score, 0 to 10

Highest EPSS

0.0248

84th percentile

Priority of the 3 CVEs

Patch now 0
                                Urgent 0
                                High 3
                                Routine 0

Fixed package versions

Product	Release	Fixed in
aspnetcore-runtime-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
aspnetcore-runtime-dbg-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
aspnetcore-targeting-pack-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet-apphost-pack-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-apphost-pack-8.0-debuginfo	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-host	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-host-debuginfo	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-hostfxr-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-hostfxr-8.0-debuginfo	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-runtime-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-runtime-8.0-debuginfo	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-runtime-dbg-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-sdk-8.0	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet-sdk-8.0-debuginfo	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet-sdk-8.0-source-built-artifacts	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet-sdk-dbg-8.0	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet-targeting-pack-8.0	amzn 2023	8.0.28-1.amzn2023.0.1
dotnet-templates-8.0	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet8.0-debuginfo	amzn 2023	8.0.128-1.amzn2023.0.1
dotnet8.0-debugsource	amzn 2023	8.0.128-1.amzn2023.0.1
netstandard-targeting-pack-2.1	amzn 2023	8.0.128-1.amzn2023.0.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-45591	ASP.NET Core Denial of Service Vulnerability	7.5	0.0248	Exploitation Less Likely
High	CVE-2026-45491	.NET Tampering Vulnerability	7.5	0.0039	Exploitation Unlikely
High	CVE-2026-45490	.NET SDK Elevation of Privilege Vulnerability	7.8	0.0038	Exploitation Less Likely

Also fixes CVE-2026-45591

Microsoft .NET Windows Desktop Runtime 8.0 8.0.30
Microsoft .NET Windows Desktop Runtime 8.0
ALAS2023-2026-1867
aspnetcore-runtime-10.0, aspnetcore-runtime-dbg-10.0, aspnetcore-targeting-pack-10.0 and 17 more on amzn 2023
ALAS2023-2026-1868
aspnetcore-runtime-9.0, aspnetcore-runtime-dbg-9.0, aspnetcore-targeting-pack-9.0 and 16 more on amzn 2023
KB5097148
.NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Windows and 1 more
KB5097149
.NET 8.0, .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS and 2 more
KB5097150
.NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on Windows and 1 more
ELSA-2026-25111
aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0 and 9 more on ol 10
ELSA-2026-25112
aspnetcore-runtime-9.0, aspnetcore-runtime-dbg-9.0, aspnetcore-targeting-pack-9.0 and 11 more on ol 10

Vendor advisory

https://alas.aws.amazon.com/AL2023/ALAS-2026-1869.html

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