CVE-2026-62899
Received Received - Intake

HTTP Request Smuggling in .NET Framework

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

Description
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-62899
EUVD
EUVD-2026-56407

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft dotnet *

Helpful Resources

Exploitability

CWE
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KEV
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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.

Attack-Flow Graph

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Executive Summary

This vulnerability involves inconsistent interpretation of HTTP requests, known as 'HTTP request/response smuggling,' in .NET. An unauthorized attacker can exploit this to bypass a security feature over a network.

Impact Analysis

An attacker could bypass security features, potentially gaining unauthorized access to systems or data. This may lead to data breaches or unauthorized actions depending on the affected .NET application.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET to address the inconsistent HTTP request interpretation. Monitor Microsoft's update guide for patches and verify their installation on affected systems.

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