CVE-2026-70188
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HTTP Request Smuggling in ASP.NET Core
Vulnerability report for CVE-2026-70188, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-13
Assigner: Microsoft Corporation
Description
Description
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | ASP.NET | Core 10.0 10.0 |
| Microsoft | ASP.NET | Core 11.0 11.0 |
| 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-444 | The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. |
