CVE-2026-33116
Published: 14 April 2026
Summary
CVE-2026-33116 is a high-severity Improper Input Validation (CWE-20) vulnerability in Microsoft .Net Framework. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 20.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Timely flaw remediation through application of Microsoft patches directly eliminates the infinite loop vulnerability in .NET, .NET Framework, and Visual Studio.
Denial-of-service protection mechanisms such as rate limiting and traffic filtering prevent remote attackers from triggering the resource-consuming infinite loop over the network.
Information input validation checks network inputs for validity, mitigating exploitation of the improper input handling that leads to the unreachable exit condition.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated network exploitation of the infinite loop (via input validation flaw) directly enables denial-of-service against affected .NET services, mapping to T1190 for public-facing applications and T1499.004 for application/system exploitation causing crash or unresponsiveness.
NVD Description
Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio allows an unauthorized attacker to deny service over a network.
Deeper analysisAI
CVE-2026-33116 is a vulnerability classified as a loop with an unreachable exit condition, resulting in an infinite loop, affecting .NET, .NET Framework, and Visual Studio. Published on 2026-04-14, it is associated with CWEs CWE-20 (Improper Input Validation), CWE-400 (Uncontrolled Resource Consumption), and CWE-835 (Loop with Unreachable Exit Condition). The issue enables an unauthorized attacker to deny service over a network, with a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating high severity due to its impact on availability.
An unauthorized attacker can exploit this vulnerability remotely over the network with low complexity, requiring no privileges, authentication, or user interaction. Exploitation triggers the infinite loop, leading to denial of service by consuming resources and potentially causing affected components to hang or crash, without impacting confidentiality or integrity.
Microsoft's Security Response Center update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33116 provides details on patches and mitigation steps for this vulnerability.
Details
- CWE(s)