Apr 2026: .NET Framework Denial of Service Vulnerability
CVE-2026-23666 Published on April 14, 2026

.NET Framework Denial of Service Vulnerability
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-23666 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Types

Improper Handling of Exceptional Conditions

The software does not handle or incorrectly handles an exceptional condition.

Race Condition within a Thread

If two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined.


Products Associated with CVE-2026-23666

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-23666 are published in these products:

Microsoft Net
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Hummingbird
 

Affected Versions

Microsoft .NET Framework 3.5: Microsoft .NET Framework 3.5 AND 4.7.2: Microsoft .NET Framework 3.5 AND 4.8: Microsoft .NET Framework 3.5 AND 4.8.1: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: Microsoft .NET Framework 4.8: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images:

Exploit Probability

EPSS
1.03%
Percentile
59.21%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.