CVE-2026-64641

high

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.

References

https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj

https://github.com/vercel/next.js/releases/tag/v16.2.11

https://github.com/vercel/next.js/releases/tag/v15.5.21

https://github.com/vercel/next.js/pull/96013

https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12

Details

Source: Mitre, NVD

Published: 2026-07-27

Updated: 2026-07-29

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 8.2

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00531