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

> CVE-2026-64641: Next.js: Denial of Service in App Router using Server Actions. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-64641
Last updated: 2026-10-24T13:10:00Z

- Published: 2026-07-27 17:40 UTC · Updated: 2026-10-24 13:10 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.86%, 58th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-834

## 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.

## Affected vendors and products

- vercel: next.js

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-64641)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-64641)
- [https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12](https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12)
- [https://github.com/vercel/next.js/pull/96013](https://github.com/vercel/next.js/pull/96013)
- [https://github.com/vercel/next.js/releases/tag/v15.5.21](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/vercel/next.js/releases/tag/v16.2.11)
- [https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj](https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-64641 · Markdown: https://rewindex.com/cve/CVE-2026-64641.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-64641 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:06:01.584Z