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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (43.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Vercel Next.js — versions >= 15.0.0, < 15.4.5, < 14.2.31
Weakness classification (CWE)
References
- github.com/vercel/next.js/security/advisories/GHSA-xv57-4mr9-wg8v (Vendor Advisory)
- github.com/vercel/next.js/commit/6b12c60c61ee80cb0443ccd20de82ca9b4422ddd (Patch)
- vercel.com/changelog/cve-2025-55173 (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.