Description
Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, 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. This issue has been fixed in versions 15.5.21 and 16.2.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| vercel | next.js | >= 13.0.0, < 15.5.21, >= 16.0.0, < 16.2.11 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | jitsucom-jitsu-console | 2.11.0-r30 | — |
| Wolfi rolling | langfuse-3 +1 | 3.224.1-r0 | — |
| Wolfi rolling | langfuse-3-compat | 3.225.7-r6 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | next | >= 13.0.0, < 15.5.21 | 15.5.21 | GHSA-m99w-x7hq-7vfj |
| npm | next | >= 16.0.0, < 16.2.11 | 16.2.11 | GHSA-m99w-x7hq-7vfj |
Advisories 1
- WID-SEC-2026-2468 Vercel Next.js: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 4, 2026
References
- https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj
- https://github.com/vercel/next.js/pull/96013
- https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12
- https://github.com/vercel/next.js/releases/tag/v15.5.21
- https://github.com/vercel/next.js/releases/tag/v16.2.11