Vulnerability · Published Oct 2, 2026 · Assigned by GitHub_M
CVE-2026-94543Next.js: Cache poisoning of SSG and ISR pages in self-hosted Next.js applications
Medium 6.3
In plain English
A medium-severity security flaw in next.js from vercel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | next | 15.5.27 | GHSA-4jqv-mc3x-m676 |
| npm | next | 16.3.8 | GHSA-4jqv-mc3x-m676 |
Affected products (as reported)
Weakness: CWE-524 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/vercel/next.js/security/advisories/GHSA-4jqv-mc3x-m676 x_refsource_CONFIRM
- https://github.com/vercel/next.js/commit/52c94abdd2ea5f416f5e8353ea8a2edd3fe311b8 x_refsource_MISC
- https://github.com/vercel/next.js/commit/719e4c67d6e92df60246f95e1d96e2dd60789a52 x_refsource_MISC
- https://github.com/vercel/next.js/releases/tag/v15.5.27 x_refsource_MISC
- https://github.com/vercel/next.js/releases/tag/v16.3.8 x_refsource_MISC