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CVE-2026-64641

CVE-2026-64641 · Next.js: Denial of Service in App Router using Server Actions

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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, 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. This issue has been fixed in versions 15.5.21 and 16.2.11.

CVSS 8.2 · High · EPSS 0.9% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • next.js

    Versions
    • >= 13.0.0, < 15.5.21: Affected
    • >= 16.0.0, < 16.2.11: Affected

    No fix published

  • next npm

    Affected ranges
    • SEMVER: ≥ 13.0.0, < 15.5.21

    Update to 15.5.21

  • next npm

    Affected ranges
    • SEMVER: ≥ 16.0.0, < 16.2.11

    Update to 16.2.11

Original sources

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