CVE-2026-88092

ASP.NET Core Tampering Vulnerability

State: Published
Severity: 9.4 Critical
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Sep 9, 2026

Description

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to perform tampering over a network.

Scores

CVSS	Score	Vector	Source
3.1	9.4 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Products

Product	Versions
ASP.NET Core 10.0Microsoft	10.0 to before 10.0.13Affected
ASP.NET Core 11.0Microsoft	11.0 to before 11.0.0-rc.2Affected
ASP.NET Core 8.0Microsoft	8.0 to before 8.0.32Affected
ASP.NET Core 9.0Microsoft	9.0 to before 9.0.21Affected
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.42Affected
Microsoft Visual Studio 2026 version 18.10Microsoft	18.10.0 to before 18.10.4Affected

References

ASP.NET Core Tampering Vulnerabilityvendor-advisorypatch

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