CVE-2026-62899HighCVSS 5.9

.NET Security Feature Bypass Vulnerability

Published
August 14, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-62899 →

📋 Description

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

🎯 Affected products10

  • .NET 10.0 installed on Linux
  • .NET 10.0 installed on Mac OS
  • .NET 8.0 installed on Linux
  • .NET 8.0 installed on Mac OS
  • .NET 8.0 installed on Windows
  • .NET 9.0 installed on Linux
  • .NET 9.0 installed on Mac OS
  • .NET 9.0 installed on Windows
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2026 version 18.8

✅ Remediation

KB5122106 (Security Update) — fixed build 10.0.11 KB5122104 (Security Update) — fixed build 8.0.30 KB5122105 (Security Update) — fixed build 9.0.19 Security Update — fixed build 17.14.38 Security Update — fixed build 18.8.3

🔗 References (7)