High severity · published Jul 27, 2026
CVE-2026-64641
Next.js: Denial of Service in App Router using Server Actions
7.5
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
next.js · vercel
>= 13.0.0, < 15.5.21; >= 16.0.0, < 16.2.11 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64641
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64641
Patch
https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12
Issue Tracking
https://github.com/vercel/next.js/pull/96013
Product
https://github.com/vercel/next.js/releases/tag/v15.5.21
Product
https://github.com/vercel/next.js/releases/tag/v16.2.11
Vendor Advisory
https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj
More from next.js
10.0
CVE-2025-55182
Meta React Server Components Remote Code Execution Vulnerability
9.1
CVE-2025-29927
Next.js is a React framework for building full-stack web applications
9.0
CVE-2026-75604
Next.js: Unauthenticated Remote Code Execution on windows-hosted servers
8.6
CVE-2026-44578
Next.js: Server-side request forgery in applications using WebSocket upgrades
8.2
CVE-2026-94482
Next.js: Denial of Service in App Router using Server Actions