A critical vulnerability in the Next.js ImageResponse feature has been disclosed, potentially allowing attackers to execute arbitrary code on the server. The issue stems from improper handling of SVG input, where attacker-controlled values—such as those extracted from request URLs—are embedded into generated images. Vercel released a fix on September 22, 2026, in version 15.2.3. Users are strongly advised to update immediately.

What should defenders do?

Update Next.js to version 15.2.3 or later. Review application code that passes user-controlled input into ImageResponse. Sanitize and validate all input parameters used in image generation. Consider restricting input sources for ImageResponse in production environments.

criticalVulnerability

Critical Next.js ImageResponse Vulnerability Enables Server-Side Code Execution via SVG Injection

Vercel patches flaw that allows attacker-controlled input to trigger remote code execution during image generation

CyberIntel DeskPublished 5 days agoUpdated less than a minute ago1 min read

Critical Next.js ImageResponse Vulnerability Enables Server-Side Code Execution via SVG Injection

Key Takeaways

A critical vulnerability in Next.js ImageResponse allows potential server-side code execution via crafted SVG input.
The flaw occurs when attacker-controlled values, such as URL parameters, are embedded into generated images.
Vercel released a fix on September 22, 2026, in version 15.2.3.

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