CVE-2025-67731 Servify Express does not enforce rate limiting when parsing JSON
Attackers can cause denial of service by sending large JSON payloads to applications using this Node.js package, leading to memory exhaustion or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-67731?
CVE-2025-67731 is a high-severity denial of service vulnerability in Aarondoran servify-express, published on 12 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Servify Express is a Node.js package to start an Express server and log the port it's running on. Prior to 1.2, the Express server used express.json() without a size limit, which could allow attackers to send extremely large request bodies. This can cause excessive memory usage, degraded performance, or process crashes, resulting in a Denial of Service (DoS). Any application using the JSON parser without limits and exposed to untrusted clients is affected. The issue is not a flaw in Express itself, but in configuration. This issue is fixed in version 1.2. To work around, consider adding a limit option to the JSON parser, rate limiting at the application or reverse-proxy level, rejecting unusually large requests before parsing, or using a reverse proxy (such as NGINX) to enforce maximum request body sizes.
Weakness: CWE-400
Which versions are affected by CVE-2025-67731?
2 open source packages ship an affected version, including servify-express. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
servify-express npm | All versions | 1.2 |
servify-express npm | All versions | 1.2 |
Products include Servify-Express.js Servify Express.
How do I fix CVE-2025-67731?
Upgrade servify-express to 1.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-67731 being exploited?
There is no known exploitation of CVE-2025-67731 in the wild and no public exploit code.
Sources
Also known as GHSA-qgc4-8p88-4w7m.