PT-2025-50903 · Unknown+2 · Servify-Express+2

Published 2025-12-12 · Updated 2025-12-12 · CVE-2025-67731

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Servify Express versions prior to 1.2

Description Servify Express is a Node.js package used to start an Express server and log the port it is running on. Versions prior to 1.2 utilize express.json() without a size limit, potentially allowing attackers to send excessively large request bodies. This can lead to excessive memory usage, degraded performance, or process crashes, resulting in a Denial of Service (DoS). Applications using the JSON parser without limits and exposed to untrusted clients are susceptible. The issue stems from configuration rather than a flaw within Express itself.

Recommendations Versions prior to 1.2 should be updated to version 1.2. Consider adding a limit option to the JSON parser. Implement rate limiting at the application or reverse-proxy level. Reject unusually large requests before parsing. Utilize a reverse proxy, such as NGINX, to enforce maximum request body sizes.

Exploit

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2025-67731

GHSA-QGC4-8P88-4W7M

Affected Products

Express

Nginx

Servify-Express

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/67xxx/CVE-2025-67731.json · Exploit
• https://github.com/Aarondoran/servify-express/security/advisories/GHSA-qgc4-8p88-4w7m · Vendor Advisory
• https://github.com/Aarondoran/servify-express/commit/8dff7f56504b356278d849734ef2050e5cd23b61 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-67731 · Security Note
• https://osv.dev/vulnerability/CVE-2025-67731 · Vendor Advisory
• https://github.com/Aarondoran/servify-express/releases/tag/V1.2 · Note
• https://t.me/CVEtracker/39601 · Telegram Post