Packages / next / Security

HighVulnerabilityGHSA-m99w-x7hq-7vfjCVE-2026-64641Published 22 Jul 2026

Next.js: Denial of Service in App Router using Server Actions

Affected releases · next

  • 16.x16.0.0 – 16.2.10Fixed in 16.2.11
  • 15.x15.0.0 – 15.5.20Fixed in 15.5.21
  • 14.x14.0.0 – 14.2.35No fix on this line yet
  • 13.x13.0.0 – 13.5.11No fix on this line yet

On 16.x, the newest line:

npm install next@16.2.11
16.x

  1. Affected

    16.0.0 – 16.2.10

    31 releases

  2. Fixed

    16.2.11 – 16.4.2

    14 releases, latest

15.x

  1. Affected

    15.0.0 – 15.5.20

    74 releases

  2. Fixed

    15.5.21 – 15.5.28

    8 releases

14.x

  1. Affected

    14.0.0 – 14.2.35

    46 releases

13.x

  1. Affected

    13.0.0 – 13.5.11

    56 releases

423 stable releases of next, oldest to newest, one row per major.

Is your project affected?

Paste your package.json, or type the range you declare for next. It is read in your browser and sent nowhere.

What happens

Impact

Crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process.

Workarounds

No workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.