GHSA-mwv6-3258-q52c Next Vulnerable to Denial of Service with Server Components
Attackers can cause server hangs and CPU exhaustion via malicious HTTP requests to App Router endpoints, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-mwv6-3258-q52c?
GHSA-mwv6-3258-q52c is a denial of service vulnerability in next, published on 11 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 for versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0, and 19.2.1 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-2025-55184.
A malicious HTTP request can be crafted and sent to any App Router endpoint that, when deserialized, can cause the server process to hang and consume CPU. This can result in denial of service in unpatched environments.
Which versions are affected by GHSA-mwv6-3258-q52c?
20 open source packages ship an affected version, including next.
| Package | Affected | Fixed in |
|---|---|---|
next npm | From 13.3.0 | 14.2.34 |
next npm | From 13.3.0 | 14.2.34 |
next npm | From 15.0.0-canary.0 | 15.0.6 |
next npm | From 15.0.0-canary.0 | 15.0.6 |
next npm | From 15.1.1-canary.0 | 15.1.10 |
next npm | From 15.1.1-canary.0 | 15.1.10 |
14 more packages
next npm | From 15.2.0-canary.0 | 15.2.7 |
next npm | From 15.2.0-canary.0 | 15.2.7 |
next npm | From 15.3.0-canary.0 | 15.3.7 |
next npm | From 15.3.0-canary.0 | 15.3.7 |
next npm | From 15.4.0-canary.0 | 15.4.9 |
next npm | From 15.4.0-canary.0 | 15.4.9 |
next npm | From 15.5.1-canary.0 | 15.5.8 |
next npm | From 15.5.1-canary.0 | 15.5.8 |
next npm | From 15.6.0-canary.0 | 15.6.0-canary.59 |
next npm | From 15.6.0-canary.0 | 15.6.0-canary.59 |
next npm | From 16.0.0-beta.0 | 16.0.9 |
next npm | From 16.0.0-beta.0 | 16.0.9 |
next npm | From 16.1.0-canary.0 | 16.1.0-canary.17 |
next npm | From 16.1.0-canary.0 | 16.1.0-canary.17 |
How do I fix GHSA-mwv6-3258-q52c?
Upgrade next to a fixed version for your release line: 14.2.34, 15.0.6, 15.1.10 or 15.2.7.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-mwv6-3258-q52c being exploited?
There is no known exploitation of GHSA-mwv6-3258-q52c in the wild and no public exploit code.