CVE-2026-40879
High
Description
Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.19, when an attacker sends many small, valid JSON messages in one TCP frame, handleData() recurses once per message; the buffer shrinks each call. maxBufferSize is never reached; call stack overflows instead. A ~47 KB payload is sufficient to trigger RangeError. This vulnerability is fixed in 11.1.19.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Nest
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-674CWE-674
How to fix
Update
- nestjs nest11.1.19 or later
- @nestjs/microservices11.1.19 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nestjs nest | v < 11.1.19 | 11.1.19 |
| @nestjs/microservicesnpm | v < 11.1.19 | 11.1.19 |
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