CVE-2025-55173
Medium
Description
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.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Vercel Next.js
PublishedAug 29, 2025
First seenAug 29, 2025
Weakness typeCWE-20Improper input validation
How to fix
Update
- vercel next.js14.2.31, 15.4.5 or later
- next14.2.31, 15.4.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | v < 14.2.31, 15.0.0 ≤ v < 15.4.5 | 14.2.31, 15.4.5 |
| nextnpm | 0.9.9 ≤ v < 14.2.31, 15.0.0 ≤ v < 15.4.5 | 14.2.31, 15.4.5 |
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