Next.js: Unauthenticated Remote Code Execution in `use cache` functions returning typed arrays

next (npm)

## Impact A vulnerability in applications using App router with Cache Component can lead to remote code execution. The application needs to have a `use cache` function that returns multiple typed arrays. ## Workaround There is no known workaround for affected applications with such `use cache` functions. You should upgrade immediately even if your…

First seen: 22 Oct 2026
Last update: 22 Oct 2026, 16:42 UTC
Fixed in: next 16.4.1
Source: GitHub advisory
On the menu as: npm packages
Next.js

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Next.js: Unauthenticated Remote Code Execution in `use cache` functions returning typed arrays
Severity: critical. Patch status: patched.
Affected: next (npm)
Fixed in: next 16.4.1

## Impact A vulnerability in applications using App router with Cache Component can lead to remote code execution. The application needs to have a `use cache` function that returns multiple typed arrays. ## Workaround There is no known workaround for affected applications with such `use cache` functions. You should upgrade immediately even if your…

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `next`. For each hit, compare the installed version with the fix on the same major line: next 16.4.1. If it's lower, give the exact upgrade command for the package manager this repo uses.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-673q-mjm6-r5xr https://github.com/vercel/next.js/commit/a4cea6aec5da89d116b8960e113189cf51745d2f https://github.com/vercel/next.js/releases/tag/v16.4.1 https://github.com/vercel/next.js/security/advisories/GHSA-673q-mjm6-r5xr
https://pwned.coffee/i/next-js-unauthenticated-remote-code-execution-in-use-cache-functions-ret

Sources

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