Input validation error in Next.js - CVE-2025-55173
Published: August 30, 2025
Vulnerability identifier: #VU114573
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-55173
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: vercel
Affected software:
Next.js
Next.js
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input within the Image Optimization feature. A remote attacker with control over external image sources can trigger file downloads with arbitrary content and filenames under specific configurations and perform phishing attacks.
How to mitigate CVE-2025-55173
Install updates from vendor's website.