What’s Vulnerable › Vulnerabilities

CVE-2026-94484: Next.js: Cache poisoning in Next.js SSG/ISR rendering leads to cross-user content substitution and persistent denial of service

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-02 · updated 2026-10-05
• Weakness: CWE-524

Description

Next.js is a React framework for building full-stack web applications. From 15.0.0 until 15.5.27 and 16.3.8, applications with a root-level catch-all page and statically generated or Incremental Static Regeneration routes can use a shared response cache key that is insufficiently scoped to the source route. A single unauthenticated crafted request can poison that cache, causing cross-user content substitution or persistent denial of service until the poisoned entry is revalidated or replaced. This issue is fixed in versions 15.5.27 and 16.3.8.

Affected products

• Next.js: from 15.0.0 before 15.5.27; from 16.0.0 before 16.3.8 — fixed in 15.5.27, 16.3.8

How to fix

Upgrade to a fixed version: Next.js 15.5.27, 16.3.8. Check the vendor advisory for mitigations.

References

• https://github.com/vercel/next.js/commit/52c94abdd2ea5f416f5e8353ea8a2edd3fe311b8
• https://github.com/vercel/next.js/commit/719e4c67d6e92df60246f95e1d96e2dd60789a52
• https://github.com/vercel/next.js/releases/tag/v15.5.27
• https://github.com/vercel/next.js/releases/tag/v16.3.8
• https://github.com/vercel/next.js/security/advisories/GHSA-mcj8-r9mp-w47p

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