GHSA-9qr9-h5gf-34mp Next.js is vulnerable to RCE in React flight protocol
Remote attackers can execute arbitrary code via the React flight protocol in affected Next.js and React server packages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-9qr9-h5gf-34mp?
GHSA-9qr9-h5gf-34mp is a code injection vulnerability in next, published on 3 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability affects certain React packages<sup>1</sup> for versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 and frameworks that use the affected packages, including Next.js 15.x and 16.x using the App Router. The issue is tracked upstream as CVE-2025-55182.
Fixed in: React: 19.0.1, 19.1.2, 19.2.1 Next.js: 15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7, 15.6.0-canary.58, 16.1.0-canary.12+
The vulnerability also affects experimental canary releases starting with 14.3.0-canary.77. Users on any of the 14.3 canary builds should either downgrade to a 14.x stable release or 14.3.0-canary.76.
All users of stable 15.x or 16.x Next.js versions should upgrade to a patched, stable version immediately.
<sup>1</sup> The affected React packages are:
- react-server-dom-parcel
- react-server-dom-turbopack
- react-server-dom-webpack
Which versions are affected by GHSA-9qr9-h5gf-34mp?
14 open source packages ship an affected version, including next.
| Package | Affected | Fixed in |
|---|---|---|
next npm | From 14.3.0-canary.77 | 15.0.5 |
next npm | From 14.3.0-canary.77 | 15.0.5 |
next npm | From 15.1.0-canary.0 | 15.1.9 |
next npm | From 15.1.0-canary.0 | 15.1.9 |
next npm | From 15.2.0-canary.0 | 15.2.6 |
next npm | From 15.2.0-canary.0 | 15.2.6 |
8 more packages
next npm | From 15.3.0-canary.0 | 15.3.6 |
next npm | From 15.3.0-canary.0 | 15.3.6 |
next npm | From 15.4.0-canary.0 | 15.4.8 |
next npm | From 15.4.0-canary.0 | 15.4.8 |
next npm | From 15.5.0-canary.0 | 15.5.7 |
next npm | From 15.5.0-canary.0 | 15.5.7 |
next npm | From 16.0.0-canary.0 | 16.0.7 |
next npm | From 16.0.0-canary.0 | 16.0.7 |
How do I fix GHSA-9qr9-h5gf-34mp?
Upgrade next to a fixed version for your release line: 15.0.5, 15.1.9, 15.2.6 or 15.3.6.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is GHSA-9qr9-h5gf-34mp being exploited?
There is no known exploitation of GHSA-9qr9-h5gf-34mp in the wild and no public exploit code.