PT-2026-63556 · Npm · Next

CVE-2026-64641 · Published 2026-07-22 · Updated 2026-07-22

OSV

CVSS v4.0

8.2

High

Base vector

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

Impact

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.

Workarounds

No workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.

Fix

Weakness Enumeration

CWE-834

Related Identifiers

CVE-2026-64641

GHSA-M99W-X7HQ-7VFJ

Affected Products

Next

References · 7

• https://osv.dev/vulnerability/GHSA-m99w-x7hq-7vfj · Vendor Advisory
• https://github.com/vercel/next.js/pull/96013 · Note
• https://github.com/vercel/next.js/releases/tag/v16.2.11 · Note
• https://github.com/vercel/next.js · Note
• https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12 · Note
• https://github.com/vercel/next.js/releases/tag/v15.5.21 · Note
• https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj · Note