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Vulnerabilities

Vulnerability · GHSA-673q-mjm6-r5xr

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

Published Oct 22, 2026 · catalog updated Oct 22, 2026 · Next.js: Unauthenticated Remote Code

Last checked Oct 23, 2026, 8 days ago.

Open the advisory

Exploitation likelihood is not on this record for GHSA-673q-mjm6-r5xr. A missing EPSS score is not a low risk. Compare Next.js: Unauthenticated Remote Code with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Next.js: Unauthenticated Remote Code).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Critical—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Version ranges on file
Affected products
npm next

## Impact A vulnerability in applications using App router with Cache Component can lead to remote code execution. The application needs to have a function that returns multiple typed arrays. ## Workaround There is no known workaround for affected applications with such functions. You should upgrade immediately even if your application does not have similar functions.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm next>= 16.0.0, <= 16.4.0

How to fix GHSA-673q-mjm6-r5xr

  • Upgrade

    GHSA-673q-mjm6-r5xr lists a fix boundary at 16.4.0. Compare the installed build with that boundary before you change production.

  • Version check

    Affected <= 16.4.0

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for GHSA-673q-mjm6-r5xr. A missing EPSS score is not a low risk. Compare Next.js: Unauthenticated Remote Code with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with >= 16.0.0, <= 16.4.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Next.js security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 22, 2026 · GitHub Advisory Database

    Detected

    ## Impact A vulnerability in applications using App router with Cache Component can lead to remote code execution. The application needs to have a function that returns multiple typed arrays. ## Workaround There is no known workaround for affected applications with such functions. You should upgrade immediately even if your application does not have similar functions.

  2. Oct 22, 2026 · GitHub Advisory Database

    Updated

    ## Impact A vulnerability in applications using App router with Cache Component can lead to remote code execution. The application needs to have a function that returns multiple typed arrays. ## Workaround There is no known workaround for affected applications with such functions. You should upgrade immediately even if your application does not have similar functions.

Sources

References

Freshness

Last verified in this catalog Oct 22, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitHub Advisory DatabaseOct 23, 2026