CVE-2026-26127: .NET Denial of Service Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Publicly Disclosed

Yes

Patch Tuesday

2026-Mar

Released

2026-03-10

EPSS Score

0.04% (percentile: 12.3%)

Description

Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.

Affected Products (8)

Developer Tools

• Microsoft.Bcl.Memory 10.0
• .NET 10.0 installed on Windows
• .NET 10.0 installed on Mac OS
• .NET 10.0 installed on Linux
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Mac OS
• .NET 9.0 installed on Windows
• Microsoft.Bcl.Memory 9.0

Security Updates (3)

• Security Update
• 5081276
• 5081278

Acknowledgments

Anonymous

Revision History

• 2026-03-10: Information published.