ASP.NET Core
CVE-2026-70188 — ASP.NET Core Security Feature Bypass Vulnerability
Executive Summary
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.
Overview
9.1
CVSS CRITICAL
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.9
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
6 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| ASP.NET Core 10.0 | 5130036 (Security Update) |
Important | Security Feature Bypass | Unknown |
| ASP.NET Core 11.0 | Release Notes (Security Update) |
Important | Security Feature Bypass | Unknown |
| ASP.NET Core 8.0 | 5130034 (Security Update) |
Important | Security Feature Bypass | Unknown |
| ASP.NET Core 9.0 | 5130035 (Security Update) |
Important | Security Feature Bypass | Unknown |
| Microsoft Visual Studio 2022 version 17.14 | Release Notes (Security Update) |
Important | Security Feature Bypass | Yes |
| Microsoft Visual Studio 2026 version 18.10 | Release Notes (Security Update) |
Important | Security Feature Bypass | 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
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
References
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