CVE-2026-70188ImportantSFBNetwork
ASP.NET Core Security Feature Bypass Vulnerability
Assessment
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.
- Severity
- Important
- CVSS base score
- 9.1CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:N/ S:U/ C:H/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Security Feature Bypass
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- ASP.NET Core
- Weakness
- CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- NetworkAV:N
- Attack complexity
- LowAC:L
- Privileges required
- NonePR:N
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- HighC:H
- Integrity
- HighI:H
- Availability
- NoneA:N
Updates that fix it
3 KBs| KB | Type | Applies to | Other CVEs |
|---|---|---|---|
| KB5130034 | Security Update | ASP.NET Core 8.0 | All CVEs in KB5130034 |
| KB5130035 | Security Update | ASP.NET Core 9.0 | All CVEs in KB5130035 |
| KB5130036 | Security Update | ASP.NET Core 10.0 | All CVEs in KB5130036 |
Affected products
Developer Tools6 affected products
- ASP.NET Core 10.0
- ASP.NET Core 11.0
- ASP.NET Core 8.0
- ASP.NET Core 9.0
- Microsoft Visual Studio 2022 version 17.14
- Microsoft Visual Studio 2026 version 18.10
What changed
First observed 14 Oct 2026No field changes in the recorded history.
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