HighGHSA-p3m5-59mp-jv5rCVE-2026-94482

Next.js: Denial of Service in App Router using Server Actions

Published 22 Oct 2026 · Updated 22 Oct 2026

Affected packages

nextnpm

Affected: >=13.0.0 <15.5.28
Fixed in: 15.5.28

Update to the fixed version for your release line, for example:npm install next@15.5.28

nextnpm

Affected: >=16.0.0 <16.4.1
Fixed in: 16.4.1

Update to the fixed version for your release line, for example:npm install next@16.4.1

Details

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.

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.