CVE-2026-70196: CWE-407: Inefficient Algorithmic Complexity in Microsoft ASP.NET Core 10.0
Description
Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network.
CVSS v3.1
Score 5.9medium
Affected software
Microsoft
ASP.NET Core 10.0
Microsoft
ASP.NET Core 8.0
Microsoft
ASP.NET Core 9.0
Microsoft
Microsoft Visual Studio 2022 version 17.14
Microsoft
Microsoft Visual Studio 2026 version 18.10
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-70196 involves inefficient algorithmic complexity (CWE-407) in the FormPipeReader of Microsoft.AspNetCore.WebUtilities. When form data arrives incrementally, the FormPipeReader repeatedly rescans the entire buffered body, causing quadratic CPU usage growth. This can lead to denial of service conditions due to excessive CPU consumption. The issue affects Microsoft .NET projects using affected versions of Microsoft.AspNetCore.App.Runtime packages across various platforms and architectures. Microsoft has provided official fixes in updated package versions to resolve this vulnerability.
Potential Impact
The vulnerability causes high CPU consumption leading to denial of service (DoS) conditions. There is no impact on confidentiality or integrity. The CVSS 3.1 score is 5.9 (medium severity) with network attack vector, high attack complexity, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and developers should update affected Microsoft.AspNetCore.App.Runtime packages to the patched versions (e.g., 8.0.32, 9.0.21, 10.0.13, 17.14.42, 18.10.4) as appropriate. No additional mitigation is required beyond applying these updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T23:48:30.861Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70196","vendor":"Microsoft"}]
Threat ID: 6ace84d62cdf04f6569f129f
Added to database: 10/13/2026, 19:21:58 UTC
Last enriched: 10/13/2026, 22:00:27 UTC
Last updated: 10/13/2026, 22:50:42 UTC
Views: 3
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