vercel/next.js · Security
Next.js: Denial of Service in App Router using Server Actions
- GHSA ID
- GHSA-m99w-x7hq-7vfj
- CVE ID
- CVE-2026-64641
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.2 · 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
Description
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.
CWEs
- CWE-834 · Excessive Iteration
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 ↗
- https://github.com/advisories/GHSA-m99w-x7hq-7vfj ↗