Critical Next.js ImageResponse Flaw Can Lead to Server Code Execution via Crafted SVG Input

Critical Next.js ImageResponse Flaw Can Lead to Server Code Execution via Crafted SVG Input Swati KhandelwalSep 23, 2026Vulnerability / Web Security A new security vulnerability in Next.js could allow attackers to run code on a server via ImageResponse, the feature that generates Open Graph and other social preview images, Vercel said. The risk applies when an app puts values an attacker controls, such as text read from the request URL, into the image. Vercel, which develops Next.js, fixed the flaw on September 22 in version 16.3.6. The flaw, tracked as CVE-2026-94545, affects Next.js 16.2.0 through 16.3.5 when ImageResponse runs on the Node.js runtime, which Next.js uses by default. Vercel's advisory rates it critical, with a CVSS score of 9.5. The…