CVE-2026-84008
Description
A flaw was found in .NET. Due to inefficient algorithmic complexity, an unauthorized remote attacker can send specially crafted requests over the network to cause excessive resource consumption. This issue can result in a Denial of Service (DoS), rendering the affected application unresponsive to legitimate users.
Statement
A flaw was found in .NET caused by inefficient algorithmic complexity. An unauthenticated remote attacker could exploit this vulnerability by sending specially crafted network requests to an application running on an affected .NET runtime or framework component. Processing these requests triggers excessive CPU or memory resource consumption, leading to severe performance degradation or complete process unresponsiveness, resulting in a denial of service for legitimate users without compromising data integrity or confidentiality.
Mitigation
Deploy reverse-proxy rate limiting and request timeout thresholds to drop abnormally slow or complex incoming network requests before they reach the backend .NET service. Enforce CPU and memory cgroup limits on application containers to isolate resource exhaustion to the impacted service.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: 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
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
Attackers can create crafted inputs that intentionally cause the regular expression to use excessive backtracking in a way that causes the CPU consumption to spike.
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