CVE-2026-64646

Summary

Next.js: Unbounded Server Action payload in Edge runtime

Severity

medium

EPSS

0.5% (p44)

CWE

CWE-770

Also known as

GHSA-4c39-4ccg-62r3

Published

2026-07-22

Updated

2026-07-22

Advisory details

Impact

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

Workarounds

If you cannot upgrade, ensure your hosting provider limits the request's body size. 5 MiB should be allowed at max by your hosting provider.

References

• https://github.com/advisories/GHSA-4c39-4ccg-62r3
• https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3
• https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4
• https://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17
• https://github.com/vercel/next.js/releases/tag/v15.5.21
• https://github.com/vercel/next.js/releases/tag/v16.2.11

Related advisories

• CVE-2026-94482 — high · npm/next
• GHSA-673q-mjm6-r5xr — critical · npm/next
• GHSA-2464-fhr4-w9xw — critical · npm/next
• GHSA-vcvr-r3jv-pc5j — critical · npm/next
• GHSA-2xp9-vwfh-vxw4 — critical · npm/next
• CVE-2026-75604 — critical · npm/next
• CVE-2026-94483 — high · npm/next
• CVE-2026-64649 — high · npm/next

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