CVE-2026-70196

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Denial of Service in ASP.NET Core

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

Probability:
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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-2026-70196

EUVD

EUVD-2026-99695

Affected Vendors & Products

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

KEV

CWE ID	Description
CWE-407	An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

Attack-Flow Graph

Executive Summary

This vulnerability involves inefficient algorithmic complexity in ASP.NET Core, which allows an unauthorized attacker to cause a denial of service over a network.

Impact Analysis

An attacker could exploit this to disrupt services, leading to downtime and reduced availability of applications relying on ASP.NET Core.

Compliance Impact

This vulnerability enables denial-of-service attacks, which could disrupt services handling sensitive data. GDPR and HIPAA require availability of personal and health data, so such disruptions may violate compliance by impairing access to critical systems.

Mitigation Strategies

Apply the latest security updates from Microsoft for ASP.NET Core versions 8.0, 9.0, or 10.0 as soon as they become available to address the inefficient algorithmic complexity issue.

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