CPU Resource Exhaustion Vulnerability in Next.js Framework by Vercel
CVE-2026-64641

8.2HIGH

Key Information:

Vendor

Vercel
Status
Next.js
Vendor
CVE Published:
27 July 2026

What is CVE-2026-64641?

The Next.js framework, utilized for building robust full-stack web applications, is susceptible to a resource exhaustion vulnerability. This issue arises when specific crafted requests are directed at applications using the App Router that incorporates at least one Server Action. Such requests can result in excessive CPU usage, ultimately blocking the processing of subsequent requests within the same process. This presents a significant operational challenge for developers and users, hindering application performance and responsiveness. Resolutions for this vulnerability have been implemented in versions 15.5.21 and 16.2.11.

Affected Version(s)

next.js >= 13.0.0, < 15.5.21 < 13.0.0, 15.5.21

next.js >= 16.0.0, < 16.2.11 < 16.0.0, 16.2.11

References

https://github.com/vercel/next.js/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/vercel/next.js/pull/96013
x_refsource_MISC
https://github.com/vercel/next.js/commit/019628571641dec5...
x_refsource_MISC

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.