CVE-2025-55173: Vercel Next.js

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Vercel Next.js: before 14.2.31 (fixed in 14.2.31); from 15.0.0, before 15.4.5 (fixed in 15.4.5)

Published 2025-08-29. Last modified 2026-06-17.