Next.js MEM EXC via Server Actions Edge runtime (1315.5.20, 1616.2.10)
CVE-2026-64646 Published on July 27, 2026
Next.js: Unbounded Server Action payload in Edge runtime
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.
Vulnerability Analysis
CVE-2026-64646 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-64646
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Affected Versions
vercel next.js:- Version >= 13.0.0 < 15.5.21 is affected.
- Version >= 16.0.0, < 16.2.11 is affected.