CVE-2026-64641
Next.js: Denial of Service in App Router using Server Actions
- State
- Published
- Severity
- 8.2 High
- Published
- Jul 27, 2026
- Updated
- Jul 27, 2026
- Reserved
- Jul 20, 2026
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, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-834 Excessive Iteration
Affected Products
| Product | Versions |
|---|---|
next.jsvercel |
|
References
- https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj
- https://github.com/vercel/next.js/pull/96013
- https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12
- https://github.com/vercel/next.js/releases/tag/v15.5.21
- https://github.com/vercel/next.js/releases/tag/v16.2.11
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