Improper input validation in Vercel Next.js
CVE-2025-55173
Next.js is a React framework for building full-stack web applications. In versions before 14.2.31 and from 15.0.0 to before 15.4.5, Next.js Image Optimization is vulnerable to content injection. The issue allowed attacker-controlled external image sources to trigger file downloads with arbitrary content and filenames under specific configurations. This behavior could be abused for phishing or malicious file delivery. This vulnerability has been fixed in Next.js versions 14.2.31 and 15.4.5.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.005 (40.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Vercel Next.js — versions >= 15.0.0, < 15.4.5, < 14.2.31
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-55173?
- CVE-2025-55173 is a medium-severity vulnerability in Vercel Next.js, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2025-08-29.
- How severe is CVE-2025-55173?
- Medium severity. CVSS v3 base score is 4.3 out of 10.