What is CVE-2026-23869? React Server Components Security Alert
Blog post from Fastly
A high-severity vulnerability identified as CVE-2026-23869, with a CVSS score of 7.5, was discovered in React Server Components on April 8th, posing a risk of Denial of Service via specially crafted HTTP requests targeting App Router Server Function endpoints. The affected components include Next.js versions 13.x to 16.x and related packages using specific react-server-dom versions. While it is imperative to patch these components as soon as possible, Fastly offers an immediate virtual patch solution for Next-Gen WAF customers to mitigate the risk until updates can be applied. This virtual patch can be enabled through the Fastly interface to switch from logging to blocking mode, providing temporary protection and allowing businesses time to implement permanent fixes. Fastly emphasizes its commitment to protecting customer services by offering these virtual patches and provides additional guidance through documentation and support for both existing and new customers.
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