CVE intelligence

CVE-2026-62899

Vulnerability intelligence

Published Aug 11, 2026Sources checked Oct 28, 2026

5.9MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-62899 and is rated Medium severity with a CVSS score of 5.9. 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: Aug 11, 2026

Vendor remediation details

Install KB5122106. Install KB5122104. Install KB5122105.

Vendor-listed releases

10.0.11
8.0.30
9.0.19
17.14.38
18.8.3

CISA KEVNot listedBased on the latest collected catalog

EPSS0.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-62899?

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

Source: NVD