CVE-2026-64641: Next.js: Denial of Service in App Router using Server Actions
High · CVSS 7.5 (CVSS 3.1)EPSS 0.86%, 58th percentilePublished Updated Assigner: GitHub_M
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-834
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
vercel: next.js
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12 (opens in new tab)
- github.com/vercel/next.js/pull/96013 (opens in new tab)
- github.com/vercel/next.js/releases/tag/v15.5.21 (opens in new tab)
- github.com/vercel/next.js/releases/tag/v16.2.11 (opens in new tab)
- github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)