Overview

CVE-2025-11149 is a critical vulnerability affecting all versions of the package node-static and @nubosoftware/node-static. This flaw is due to the package’s failure to catch exceptions when the user input includes null bytes. This weakness allows attackers to crash servers, which could potentially compromise systems or lead to data leakage.

Vulnerability Summary

CVE ID: CVE-2025-11149
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System crash. Potential system compromise or data leakage.

Affected Products

Product | Affected Versions

node-static | All versions
@nubosoftware/node-static | All versions

How the Exploit Works

The exploit works by making use of a failure in the node-static and @nubosoftware/node-static packages to catch exceptions when user input includes null bytes. An attacker can send a request to http://host/%00, which the server fails to handle appropriately, resulting in a server crash.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited. This example is an HTTP request that includes null bytes (%00), which leads to a server crash:

GET /%00 HTTP/1.1
Host: vulnerable-host.example.com

Mitigation and Recommendations

The recommended mitigation for this vulnerability is to apply the vendor patch as soon as it’s available. In the interim, using Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can provide temporary mitigation. Regularly updating and patching software is key to ensuring the security of systems. Additionally, it is good practice to handle exceptions properly and sanitize user inputs to avoid similar vulnerabilities.