medium4.8
CVE-2026-94484
Next.js has cache poisoning in SSG/ISR rendering that leads to cross-user content substitution and persistent denial of service
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | next | >= 16.0.0, < 16.3.8 | 16.3.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vercel | Next.Js | from 15.0.0 before 15.5.27 from 16.0.0 before 16.3.8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-mcj8-r9mp-w47p
- https://github.com/vercel/next.js/security/advisories/GHSA-mcj8-r9mp-w47p
- https://nvd.nist.gov/vuln/detail/CVE-2026-94484
- 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