Next.js: Unbounded Server Action payload in Edge runtime

MEDIO 5.3CVE-2026-64646 · GHSA-4c39-4ccg-62r3 · Published 27/07/2026 · updated 24/10/2026

Package	Affected versions	Patched versions
next.js vercel	`≥ 13.0.0, < 15.5.21≥ 16.0.0, < 16.2.11`	`15.5.2116.2.11`
next npm	`≥ 13.0.0, < 15.5.21≥ 16.0.0, < 16.2.11`	`15.5.2116.2.11`

Description

Impact

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

Workarounds

If you cannot upgrade, ensure your hosting provider limits the request's body size. 5 MiB should be allowed at max by your hosting provider.

NVD 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.

References

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free