RLSA-2026:21291: dotnet8.0 security update

RLSA-2026:21291, released May 29, 2026, fixes 2 CVEs in dotnet8.0 (version 0:8.0.127-1.el8_10). 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

0.0243

84th percentile

Priority of the 2 CVEs

Patch now 0
                                Urgent 0
                                High 2
                                Routine 0

Fixed package versions

Product	Release	Fixed in
dotnet8.0	rocky 8	0:8.0.127-1.el8_10

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-42899	ASP.NET Core Denial of Service Vulnerability	7.5	0.0243	Exploitation Unlikely
High	CVE-2026-34043	node-serialize-javascript: Serialize JavaScript to a superset of JSON that includes regular expressions and functions	7.5	0.0049	None reported

Also fixes CVE-2026-42899

Microsoft .NET Windows Desktop Runtime 8.0 8.0.30
Microsoft .NET Windows Desktop Runtime 8.0
KB5093446
.NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Windows
KB5093447
.NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows
KB5093448
.NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on Windows
ELSA-2026-21286
aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0 and 9 more on ol 10
ELSA-2026-21293
aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0 and 9 more on ol 9
ALAS2023-2026-1802
aspnetcore-runtime-9.0, aspnetcore-runtime-dbg-9.0, aspnetcore-targeting-pack-9.0 and 16 more on amzn 2023
ALAS2023-2026-1803
aspnetcore-runtime-10.0, aspnetcore-runtime-dbg-10.0, aspnetcore-targeting-pack-10.0 and 17 more on amzn 2023

Vendor advisory

https://errata.rockylinux.org/RLSA-2026:21291

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