Is CVE-2026-118748 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-118748 being exploited in the wild.

How severe is CVE-2026-118748?

High severity, with a CVSS score of 7.5, published 10 November 2026.

Which products and versions are affected?

Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) >= 11.0.0-preview.7.26381.103, = 11.0.0-preview.7.26381.103, = 11.0.0-preview.7.26381.103, = 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; and 7 more.

Is there a fix for CVE-2026-118748?

Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-118748 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-118748?

Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-118748: Microsoft ASP.NET Core denial of service via resource exhaustion

Q: Is there a fix for CVE-2026-118748?

Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-118748 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-118748?

Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-118748 · Severity: high · CVSS 7.5 · Published 2026-11-10

ASP.NET Core, a web framework used to build APIs and web applications, contains a resource exhaustion vulnerability that allows attackers to overwhelm the application with requests and cause a denial of service. An attacker on the network can trigger excessive resource allocation without limits, taking down web services or making them unavailable to legitimate users.

Quick answers

Is CVE-2026-118748 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-118748 being exploited in the wild.
How severe is CVE-2026-118748?: High severity, with a CVSS score of 7.5, published 10 November 2026.
Which products and versions are affected?: Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; and 7 more.
Is there a fix for CVE-2026-118748?: Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-118748 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-118748?: Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 11.0.0

Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 11.0.0

Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.osx-arm64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.osx-x64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 11.0.0

Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later

dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 11.0.0

Technical details

The vulnerability is an allocation of resources without limits or throttling in ASP.NET Core, allowing network-based denial of service. An unauthenticated attacker can exploit this over the network to exhaust server resources and cause service outage. No user interaction or prior authentication is required for exploitation.

Affected products

Microsoft ASP.NET Core

Identifiers

CVE-2026-118748
GHSA-5h82-77p6-2wp3

Timeline

2026-11-10: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118748

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