What’s Vulnerable › Vulnerabilities

CVE-2026-94543: Next.js: Cache poisoning of SSG and ISR pages in self-hosted Next.js applications

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-02 · updated 2026-10-06
• 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, self-hosted applications using the Pages Router with statically generated or Incremental Static Regeneration pages can key a response cache entry without sufficiently binding it to the source route. A request can replace one page's cache entry with content from a different route, causing the affected page to serve incorrect content to every visitor until revalidation. Applications deployed on Vercel are not affected. 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-4jqv-mc3x-m676

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