CVE-2026-64646Next.js: Unbounded Server Action payload in Edge runtime

Description

Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive memory consumption if that Server Actions uses the Edge runtime. This issue has been fixed in versions 15.5.21 and 16.2.11.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3 Vendor Advisory
• https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4 Patch
• https://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17 Patch
• https://github.com/vercel/next.js/releases/tag/v15.5.21 ProductRelease Notes
• https://github.com/vercel/next.js/releases/tag/v16.2.11 ProductRelease Notes