CVE-2024-32652 in node-server
Summary
by MITRE • 04/19/2024
The adapter @hono/node-server allows you to run your Hono application on Node.js. Prior to 1.10.1, the application hangs when receiving a Host header with a value that `@hono/node-server` can't handle well. Invalid values are those that cannot be parsed by the `URL` as a hostname such as an empty string, slashes `/`, and other strings. The version 1.10.1 includes the fix for this issue.
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Analysis
by VulDB Data Team • 09/17/2025
The vulnerability identified as CVE-2024-32652 affects the @hono/node-server adapter used for running Hono applications on Node.js platforms. This issue represents a denial of service condition that occurs when the server encounters malformed Host headers in incoming HTTP requests. The vulnerability specifically impacts versions prior to 1.10.1 where the server fails to properly handle certain invalid Host header values that cannot be processed by the underlying URL parsing mechanism. The affected scenarios include empty strings, forward slashes, and other malformed hostname values that the URL constructor cannot parse correctly, leading to application hanging behavior rather than graceful error handling.
The technical flaw stems from inadequate input validation and error handling within the server's request processing pipeline. When a Host header contains values that the URL constructor cannot interpret as valid hostnames, the server enters an infinite loop or hangs state instead of returning an appropriate HTTP error response. This behavior violates the fundamental principle of robust error handling in network services and represents a classic example of improper exception management. The vulnerability manifests as a resource exhaustion issue where the server process becomes unresponsive to further requests, effectively rendering the application unavailable to legitimate users.
From an operational perspective, this vulnerability creates significant security and availability concerns for applications using the affected Hono server adapter. The hanging behavior can be exploited by attackers to perform denial of service attacks against web applications, potentially causing service disruption and impacting business operations. The vulnerability affects the server's ability to maintain consistent availability and can lead to cascading failures in larger application architectures. Organizations relying on Hono applications for API services, web applications, or microservices architectures face potential downtime and degraded performance when this vulnerability is present in their deployments.
The fix implemented in version 1.10.1 addresses the core issue by introducing proper input validation and error handling for Host header values. This update ensures that malformed Host headers are either rejected with appropriate HTTP status codes or processed in a way that prevents server hanging. The mitigation strategy aligns with security best practices for input validation and defensive programming as outlined in CWE-20, which covers "Improper Input Validation" and CWE-707, which addresses "Improper Neutralization of Input During Web Page Generation." The solution also reflects principles from the ATT&CK framework's defense evasion techniques, where proper error handling prevents exploitation of resource exhaustion vulnerabilities. Organizations should prioritize upgrading to version 1.10.1 or later to remediate this vulnerability and maintain application availability and security posture.