CVE-2026-64646: 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

mediumCVSS 5.3CVE-2026-64646

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.3
Published: 2026-07-27
Last updated: 2026-07-29
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-64646

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-646460.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64646	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Vercel Next.js: Multiple Vulnerabilitiescert-bund
mediumGHSA-4c39-4ccg-62r3: Next.js: Unbounded Server Action payload in Edge runtimeghsa

Recent advisories for Next.js is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Vercel Next.js: Multiple Vulnerabilitiescert-bund · 2026-07-28
mediumCVE-2026-64649: Next.js is a React framework for building full-stack web applications. In versions 14.1.1 thro…nvd · 2026-07-27
mediumCVE-2026-64648: Next.js is a React framework for building full-stack web applications. In versions 12.0.0 thro…nvd · 2026-07-27
mediumCVE-2026-64647: Next.js is a React framework for building full-stack web applications. In versions 12.0.0 thro…nvd · 2026-07-27
mediumCVE-2026-64645: Next.js is a React framework for building full-stack web applications. In versions 12.0.0 thro…nvd · 2026-07-27
mediumCVE-2026-64644: Next.js is a React framework for building full-stack web applications. In versions 15.5.0 thro…nvd · 2026-07-27