CVE-2026-64641
Next.js: Denial of Service in App Router using Server Actions
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-834 |
| Vendor | vercel |
| Product | next.js |
| Published | Jul 27, 2026 |
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Affected Versions
vercel / next.js
>= 13.0.0, < 15.5.21 >= 16.0.0, < 16.2.11
References
github.com: https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj github.com: https://github.com/vercel/next.js/pull/96013 github.com: https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12 github.com: https://github.com/vercel/next.js/releases/tag/v15.5.21 github.com: https://github.com/vercel/next.js/releases/tag/v16.2.11