Aug 2026: .NET Security Feature Bypass Vulnerability
CVE-2026-62899 Published on August 11, 2026
.NET Security Feature Bypass Vulnerability
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2026-62899 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-62899
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Affected Versions
Microsoft .NET 10.0:- Version 10.0.0 and below 10.0.11 is affected.
- Version 8.0.0 and below 8.0.30 is affected.
- Version 9.0.0 and below 9.0.19 is affected.
- Version 17.14.0 and below 17.14.38 is affected.
- Version 18.0 and below 18.8.3 is affected.