RLSA-2026:25221: dotnet9.0 security update

RLSA-2026:25221, released June 13, 2026, fixes 2 CVEs in dotnet9.0 (version 0:9.0.118-1.el9_8). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

7.5

Base score, 0 to 10

Highest EPSS

0.0248

84th percentile

Priority of the 2 CVEs

Patch now 0
                                Urgent 0
                                High 2
                                Routine 0

Fixed package versions

Product	Release	Fixed in
dotnet9.0	rocky 9	0:9.0.118-1.el9_8

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

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
ALAS2023-2026-1869
aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0 and 19 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

Vendor advisory

https://errata.rockylinux.org/RLSA-2026:25221

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