CVE-2026-64641 Details
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.
A denial-of-service vulnerability has been identified in Next.js, a React framework for full-stack web applications. This issue affects versions 13.0.0 prior to 15.5.21 and 16.0.0 prior to 16.2.11. The vulnerability arises when crafted requests target Next.js applications using the App Router feature, specifically those that include at least one Server Action. Exploitation of this vulnerability can lead to excessive CPU usage, causing delays in processing further requests within the same application process. Notably, applications that utilize the Pages Router or do not employ Server Actions are not vulnerable.
Users can upgrade to Next.js versions 15.5.21 or 16.2.11 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12 | [email protected] | Patch |
| https://github.com/vercel/next.js/pull/96013 | [email protected] | Issue TrackingPatch |
| https://github.com/vercel/next.js/releases/tag/v15.5.21 | [email protected] | ProductRelease Notes |
| https://github.com/vercel/next.js/releases/tag/v16.2.11 | [email protected] | ProductRelease Notes |
| https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-834 | Excessive Iteration | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vercel next.js | >= 13.0.0, < 15.5.21 >= 16.0.0, < 16.2.11 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 29, 2026 | Initial Analysis | [email protected] |
| Jul 27, 2026 | CVE Modified | CISA-ADP |
| Jul 27, 2026 | New CVE Received | [email protected] |