Next.js is a React framework. Starting with version 10.0.0 and prior to version 12.1.0, Next.js is vulnerable to User Interface (UI) Misrepresentation of Critical Information. In order to be affected, the next.config.js file must have an images.domains array assigned and the image host assigned in images.domains must allow user-provided SVG. If the next.config.js file has images.loader assigned to something other than default, the instance is not affected. Version 12.1.0 contains a patch for this issue. As a workaround, change next.config.js to use a different loader configuration other than the default.

Impact The image optimization feature of Next.js contained a vulnerability which allowed for a potential Denial of Service (DoS) condition which could lead to excessive CPU consumption.

Not affected: - The next.config.js file is configured with images.unoptimized set to true or images.loader set to a non-default value. - The Next.js application is hosted on Vercel.

Patches This issue was fully patched in Next.js 14.2.7. We recommend that users upgrade to at least this version.

Workarounds Ensure that the next.config.js file has either images.unoptimized, images.loader or images.loaderFile assigned.

Credits Brandon Dahler (brandondahler), AWS Dimitrios Vlastaras