# CVE-2026-64646: Next.js: Unbounded Server Action payload in Edge runtime

> CVE-2026-64646: Next.js: Unbounded Server Action payload in Edge runtime. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-64646
Last updated: 2026-10-24T13:10:00Z

- Published: 2026-07-27 18:54 UTC · Updated: 2026-10-24 13:10 UTC · Assigner: GitHub\_M
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS: 0.52%, 44th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## 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.

## Affected vendors and products

- vercel: next.js

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-64646)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-64646)
- [https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4](https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4)
- [https://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17](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/v15.5.21)
- [https://github.com/vercel/next.js/releases/tag/v16.2.11](https://github.com/vercel/next.js/releases/tag/v16.2.11)
- [https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3](https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-64646 · Markdown: https://rewindex.com/cve/CVE-2026-64646.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-64646 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:51.876Z