VIR Vulnerability Intelligence Relay

CVE-2026-42899

high
Published 2026-05-27 · Modified 2026-05-18
CVSS v3
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v2
—
VIR risk
7.5

Description

Microsoft Security Advisory CVE-2026-42899 – ASP.NET Core Denial of Service Vulnerability

Predictions

Exploit likelihood
83%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: secure@microsoft.com — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899

vendor Authored 2026-05-27

Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2026:21297

vendor Authored 2026-05-27

Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2026:21296

vendor Authored 2026-05-27

Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2026:21293

OS impact
OSVersionStatusFixed in
redhat rhel9fixed
macos macos-not-affected
linux linux-kernel-not-affected

Package impact
EcosystemPackageVulnerableFixed
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-arm>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-x64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-x86>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64>=8.0.0,<8.0.278.0.27
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-arm>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-arm>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-x64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-x64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-x86>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.win-x86>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64>=10.0.0,<10.0.810.0.8
nuget NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64>=9.0.0,<9.0.169.0.16
nuget NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64>=10.0.0,<10.0.810.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.osx-x64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.osx-x64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.osx-arm64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.osx-arm64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-x64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-x64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-arm64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-arm64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-arm>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-arm>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-x86>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-x86>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-x64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-x64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-arm64>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-arm64>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-arm>= 10.0.0, <= 10.0.710.0.8
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-arm>= 9.0.0, <= 9.0.159.0.16
nuget NUGETMicrosoft.AspNetCore.App.Runtime.osx-x64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.osx-arm64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-x64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-x64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-musl-arm>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-arm64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.linux-arm>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-x86>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-x64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-arm64>= 8.0.0, <= 8.0.268.0.27
nuget NUGETMicrosoft.AspNetCore.App.Runtime.win-arm>= 8.0.0, <= 8.0.268.0.27

Application impact
VendorProductVersionsFixed
windows microsoft.net{"startIncluding":"8.0.0","endExcluding":"8.0.27"}8.0.27

References

CWEs

CWE-835

Verify integrity in audit chain (admin only). AS-IS.