CVE-2026-64646

medium

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, requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive memory consumption if that Server Actions uses the Edge runtime. This issue has been fixed in versions 15.5.21 and 16.2.11.

References

https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3

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/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17

https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4

Details

Source: Mitre, NVD

Published: 2026-07-27

Updated: 2026-07-29

Risk Information

CVSS v2

Base Score: 5

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

Severity: Medium

CVSS v3

Base Score: 5.3

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

Severity: Medium

CVSS v4

Base Score: 6.3

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

Severity: Medium

EPSS

EPSS: 0.00531