## Critical CVE-2026-4867 in Express.js 4.22.1: High-Severity Path-to-Regexp Vulnerability Exposes Projects
A high-severity vulnerability, CVE-2026-4867, has been identified in the widely used Express.js framework version 4.22.1. The flaw, with a CVSS score of 7.5, resides in the `path-to-regexp` dependency, a core library for parsing URL paths. This security gap exposes any application built on this specific version of Express to potential exploitation, though the exact nature of the exploit and its current maturity are not detailed in the alert. The vulnerability was flagged in a specific commit within the `DemoCorp-AI-Based-Classification` GitHub repository, pinpointing its presence in a real-world codebase.

The issue is traced directly to the `path-to-regexp` package located within the `node_modules` directory of the affected project. While the alert originates from a security scan of a single repository, the widespread adoption of Express.js means the vulnerability's footprint could be significant. The report indicates that a remediation is possible, but crucially, it does not specify a fixed version of Express.js that resolves the issue, leaving developers to seek patches or updates for the underlying `path-to-regexp` library.

This discovery places immediate pressure on development teams and security officers to audit their Node.js dependencies. Projects using Express 4.22.1 or any version that bundles the vulnerable `path-to-regexp` library are at risk. The lack of a clear, immediate fix within the Express versioning scheme complicates the patching process, potentially forcing teams to implement workarounds or seek alternative routing solutions until an official update is released. This incident underscores the persistent security challenges in the open-source software supply chain, where a single vulnerable dependency can cascade risk across countless applications.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: CVE-2026-4867, Node.js, Supply Chain Security, Open Source Vulnerability, Dependency Management
- **Credibility**: unverified
- **Published**: 2026-03-28 00:27:09
- **ID**: 38583
- **URL**: https://whisperx.ai/en/intel/38583