Oct 2026: ASP.NET Core Security Feature Bypass Vulnerability
CVE-2026-70188 Published on October 13, 2026
ASP.NET Core Security Feature Bypass Vulnerability
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.
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-2026-70188 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-70188
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Affected Versions
Microsoft ASP.NET Core 10.0:- Version 10.0 and below 10.0.13 is affected.
- Version 11.0 and below 11.0.0-rc.2 is affected.
- Version 8.0 and below 8.0.32 is affected.
- Version 9.0 and below 9.0.21 is affected.
- Version 17.14.0 and below 17.14.42 is affected.
- Version 18.10.0 and below 18.10.4 is affected.