CVE-2021-43803
High
Description
Next.js is a React framework. In versions of Next.js prior to 12.0.5 or 11.1.3, invalid or malformed URLs could lead to a server crash. In order to be affected by this issue, the deployment must use Next.js versions above 11.1.0 and below 12.0.5, Node.js above 15.0.0, and next start or a custom server. Deployments on Vercel are not affected, along with similar environments where invalid requests are filtered before reaching Next.js. Versions 12.0.5 and 11.1.3 contain patches for this issue.
SeverityHigh
CVSS7.5
Exploit probability99. percentile47.3%
Product
Vercel Next.js
PublishedDec 9, 2021
First seenDec 10, 2021
Weakness typeCWE-20Improper input validation
How to fix
Update
- vercel next.js11.1.3, 12.0.5 or later
- next12.0.5, 11.1.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | 11.1.0 ≤ v < 11.1.3, 12.0.0 ≤ v < 12.0.5 | 11.1.3, 12.0.5 |
| nextnpm | 12.0.0 ≤ v < 12.0.5, 0.9.9 ≤ v < 11.1.3 | 12.0.5, 11.1.3 |
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