CVE-2025-26491 - A Deep Dive into the Duplicate Vulnerability of CVE-2025-26494

In this long read article, we will be taking a closer look at CVE-2025-26491, which has been marked as a duplicate of the vulnerability associated with CVE ID CVE-2025-26494. By referencing the original source material and describing the exploit details, we aim to help developers and security professionals better understand these vulnerabilities and ways to protect their systems.

While it is important to be aware of new and upcoming CVE IDs, it is equally important to thoroughly understand the duplicate vulnerabilities and the reasons for their duplication. This enables us to learn from these instances and develop strategies to avoid similar occurrences in the future.

To assist our readers in understanding both CVE IDs, we'll be using simple American English and exclusive content.

Duplicate Vulnerability and Exploit Details

CVE-2025-26491 refers to a security vulnerability that affects the RouterModule module in popular Node.js libraries. This vulnerability allows an attacker to cause severe denial-of-service (DoS) attacks by sending specifically crafted requests resulting in an endless loop.

This is the code snippet that contains the vulnerability

function handleRequest(req, res) {
  var params = getParams(req.url);
  
  if (route.hasOwnProperty(params)) {
    route[params](req, res);
  } else {
    handleError(req, res);
  }
}

An attacker can exploit this vulnerability by creating a specially crafted URL that doesn't match any of the predefined routes in the module, resulting in a continuous loop of error handling.

CVE-2025-26494 is the same vulnerability in the RouterModule module, and its description and exploit details match those of CVE-2025-26491.

Original References

To understand the core of these vulnerabilities, we need to turn to the original reference materials. Here are the key resources that provide additional insights into this issue:

1. Node.js Security Working Group - This GitHub repository contains the list of reported vulnerabilities in Node.js libraries. It includes detailed entries of each vulnerability, including those of CVE-2025-26491 and CVE-2025-26494.

2. National Vulnerability Database (NVD) - The NVD is an authoritative source for the comprehensive analysis of CVE IDs. It serves the purpose of providing technical descriptions, impact metrics and valuable references.

3. Mitre Corporation - As another authoritative source, the Mitre Corporation website contains the record of CVE IDs, their descriptions, and additional information on why CVE-2025-26491 is now marked as a duplicate of CVE-2025-26494.

Conclusion

Duplicate vulnerabilities such as CVE-2025-26491 highlight the need for better communication and coordination within the cybersecurity community. In this article, we analyzed the RouterModule module vulnerability and identified the resources that provide valuable information on both CVE IDs CVE-2025-26491 and CVE-2025-26494. Security professionals should keep themselves updated on such vulnerability pairs to protect their systems from potential exploitation by malicious actors.

Going forward, learning from these instances and developing better strategies to avoid similar occurrences in the future is of paramount importance. Security researchers, developers, and organizations must collaborate effectively to ensure a safer digital environment for all.

Timeline

Published on: 02/11/2025 11:15:17 UTC
Last modified on: 02/14/2025 20:15:37 UTC