CVE-2026-70186
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ASP.NET Core Denial of Service via Deadlock

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description
Deadlock in ASP.NET Core allows an unauthorized attacker to deny service over a network.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-70186
EUVD
EUVD-2026-99689

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
Microsoft ASP.NET Core 10.0 10.0
Microsoft ASP.NET Core 8.0 8.0
Microsoft ASP.NET Core 9.0 9.0
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0
Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-833 The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock.

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Executive Summary

This vulnerability is a deadlock in ASP.NET Core that allows an unauthorized attacker to cause a denial of service over a network. It does not allow data access or modification, only service disruption.

Impact Analysis

An attacker could exploit this to make ASP.NET Core applications unresponsive, leading to service outages for users. This affects availability but not confidentiality or integrity of data.

Mitigation Strategies

Apply the latest security updates from Microsoft for ASP.NET Core versions 8.0, 9.0, or 10.0 as soon as possible to resolve the deadlock issue.

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