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ASP.NET Core

CVE-2026-88092 — ASP.NET Core Tampering Vulnerability

Important CVSS 9.4 2026-10 archive

Executive Summary

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

Overview

9.4
CVSS CRITICAL
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Tampering
Weakness CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Released Oct 13 2026
Last Updated Oct 13 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known

CVSS Vector

ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
Low
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.2

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

6 affected products
Product KB Article Severity Impact Restart Required
ASP.NET Core 10.0 5130036 (Security Update) Important Tampering Unknown
ASP.NET Core 11.0 Release Notes (Security Update) Important Tampering Unknown
ASP.NET Core 8.0 5130034 (Security Update) Important Tampering Unknown
ASP.NET Core 9.0 5130035 (Security Update) Important Tampering Unknown
Microsoft Visual Studio 2022 version 17.14 Release Notes (Security Update) Important Tampering Yes
Microsoft Visual Studio 2026 version 18.10 Release Notes (Security Update) Important Tampering Yes

Patches

4 patches
Article Type Restart
5130036 Security Update Unknown
Release Notes Security Update Unknown
5130034 Security Update Unknown
5130035 Security Update Unknown

Exploits & PoC

Detection Rules

Acknowledgments

thegoldmandm

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