NUGET · AUGUST 2026 · EARLY WARNING

Microsoft.NETCore.App.Runtime Vulnerability: Information Disclosure Threat

Q: Am I affected?

You are affected if your Microsoft .NET project uses the Microsoft.NETCore.App.Runtime package with versions within the specified affected ranges.

Q: What should I do right now?

Immediately upgrade to the patched versions of the Microsoft.NETCore.App.Runtime package as specified in the mitigation steps.

Q: Is this vulnerability being exploited in the wild?

There is no confirmed report of this vulnerability being exploited in the wild at this time.

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.

Severity: HIGH
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Affected component: microsoft.netcore.app.runtime.win-arm64 (nuget)
Affected versions: >= 10.0.0, <= 10.0.10 or >= 9.0.0, <= 9.0.18 or >= 8.0.0, <= 8.0.29
Patched version: 10.0.11

CVE-2026-62898GHSA-C494-M2FQ-59MX

An early warning has been issued for a high-severity vulnerability in the Microsoft.NETCore.App.Runtime package. This vulnerability, tracked as CVE-2026-62898, could allow unauthorized attackers to disclose information over a network.

What happened

Reportedly, a use after free vulnerability in Microsoft QUIC affects Microsoft.NET projects using certain versions of the Microsoft.NETCore.App.Runtime package. This vulnerability is under investigation and has a CVSS score of 7.5. It is not yet confirmed to be exploited in the wild.

The affected versions include microsoft.netcore.app.runtime.win-arm64, microsoft.netcore.app.runtime.win-x64, and microsoft.netcore.app.runtime.win-x86 with specific version ranges. The vulnerability allows for information disclosure over a network without requiring any privileges or user interaction.

What to do about it

Upgrade to the patched versions of the Microsoft .NETCore.App.Runtime package to mitigate the vulnerability.
For microsoft.netcore.app.runtime.win-arm64, microsoft.netcore.app.runtime.win-x64, and microsoft.netcore.app.runtime.win-x86, upgrade to version 10.0.11 or 9.0.19.
Review your project dependencies to ensure that all instances of the affected package are updated to the patched versions.
Monitor the primary sources for any updates or additional information regarding this vulnerability.

How 0Day would have caught this

MATCHED TO YOUR ACTUAL DEPENDENCY GRAPH0Day matches every incoming threat signal against your GitHub organization’s full dependency graph, including transitive dependencies. If microsoft.netcore.app.runtime.win-arm64 is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.

Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.

Frequently asked questions

Am I affected?

You are affected if your Microsoft .NET project uses the Microsoft.NETCore.App.Runtime package with versions within the specified affected ranges.

What should I do right now?

Immediately upgrade to the patched versions of the Microsoft.NETCore.App.Runtime package as specified in the mitigation steps.

Is this vulnerability being exploited in the wild?

There is no confirmed report of this vulnerability being exploited in the wild at this time.

Sources

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