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Vulnerabilities

Vulnerability · GHSA-p3m5-59mp-jv5r

Denial of Service in App Router using Server Actions

Published Oct 14, 2026 · catalog updated Oct 14, 2026 · Denial of Service in

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for GHSA-p3m5-59mp-jv5r. A missing EPSS score is not a low risk. Compare Denial of Service in 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 (Denial of Service in).
  • 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
High—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Version ranges on file
Affected products
npm next

## Impact Crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. ## Workarounds No workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.

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
  • npm next>=13.0.0 <= 15.5.27

How to fix GHSA-p3m5-59mp-jv5r

  • Upgrade

    GHSA-p3m5-59mp-jv5r lists a fix boundary at 16.4.0. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in >= 16.0.0 <= 16.4.0 · 1 other packages on the advisory

  • Advisory

    Open the inventory_github record and follow its fix.

  • 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-p3m5-59mp-jv5r. A missing EPSS score is not a low risk. Compare Denial of Service in with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with >= 16.0.0 <= 16.4.0, >=13.0.0 <= 15.5.27. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. 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.

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · Maintainer security tabs

    Detected

    ## Impact Crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. ## Workarounds No workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.

Sources

  • Maintainer security tabsVendor advisoryGHSA-p3m5-59mp-jv5r

    ## Impact Crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. ## Workarounds No workaround exists besides upgrading. Applications using Pages Router or not using Server Actions are not vulnerable.

    github.com

Freshness

Last verified in this catalog Oct 14, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Maintainer security tabsNov 2, 2026