CVE-2026-64641

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

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

Weaknesses (CWE)

• CWE-834

Advisories

• GHSA-m99w-x7hq-7vfj — Next.js: Denial of Service in App Router using Server Actions

European references

• ENISA EUVD · EUVD-2026-49381
• GCVE · GCVE-0-2026-64641

CERT-FR advisories

• CERTFR-2026-AVI-1291 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1256 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* ≥ 13.0.0 < 15.5.21
• cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* ≥ 16.0.0 < 16.2.11

Affected products

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

Sources