CVE intelligence

CVE-2026-70188

Vulnerability intelligence

Published Oct 13, 2026Sources checked Oct 21, 2026

9.1CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-70188 and is rated Critical severity with a CVSS score of 9.1. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 15, 2026

Vendor remediation details

Release Notes Install KB5130035. Install KB5130036. Install KB5130034.

Vendor-listed releases

18.10.4
17.14.42
11.0.0-rc.2
9.0.21
10.0.13
8.0.32

CISA KEVNot listedBased on the latest collected catalog

EPSS0.8%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-70188?

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.

Source: NVD