Next.js has disclosed a critical SVG image-processing vulnerability that could allow unauthenticated remote code execution on affected systems. The October 14, 2026, security update addresses this issue alongside another critical code-execution vulnerability and a high-severity denial-of-service flaw. The SVG vulnerability, tracked as CVE-2026-96889, affects specific Next.js versions and may expose production applications running on glibc-based Linux systems. The attack can begin when a vulnerable application processes a specially crafted SVG image through the image optimization pipeline. The underlying issue resides in an upstream image-processing library used by Next.js through the sharp package. If an exposed endpoint processes attacker-controlled SVG content, a remote attacker may trigger the memory-related flaw without authentication, potentially compromising the server. Exposure depends on the application configuration, runtime and operating system. During the exploitation phase, successful exploitation could enable arbitrary code execution within the affected server environment, potentially allowing unauthorized operations and further system compromise. The same security release also addresses a separate remote code execution flaw involving Cache Components and certain use cache functions, as well as a denial-of-service vulnerability affecting App Router applications using Server Actions. Public disclosures have not confirmed active exploitation of these vulnerabilities. Organizations should immediately upgrade Next.js 15.x to version 15.5.28 or 16.x to version 16.4.1, verify that sharp is version 0.35.5 or later, and rebuild and redeploy affected applications. Review image-processing endpoints and server logs for suspicious SVG requests, assess Cache Components and Server Actions usage, and investigate signs of compromise. If immediate patching is not possible, apply the documented temporary mitigation for SVG processing and prioritize remediation. Regular dependency audits and security monitoring are essential to reduce exposure to exploitation.
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