NestJS Nest up to 11.2.3/12.0.1 TCP Transport/RabbitMQ Transport ServerTCP#handleMessage/ServerRMQ#handleMessage Pattern stack-based overflow

Summaryinfo

A vulnerability marked as problematic has been reported in NestJS Nest up to 11.2.3/12.0.1. This vulnerability affects the function ServerTCP#handleMessage/ServerRMQ#handleMessage of the component TCP Transport/RabbitMQ Transport. This manipulation of the argument Pattern causes stack-based overflow. This vulnerability is registered as CVE-2026-102281. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in NestJS Nest up to 11.2.3/12.0.1 and classified as problematic. Affected by this vulnerability is the function ServerTCP#handleMessage/ServerRMQ#handleMessage of the component TCP Transport/RabbitMQ Transport. The manipulation of the argument pattern with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability. The summary by CVE is:

Nest is a framework for building scalable Node.js server-side applications. Prior to 11.2.4 and 12.0.2, a single message with a deeply nested object in its pattern can terminate a NestJS microservice using the TCP or RabbitMQ transport. ServerTCP#handleMessage and ServerRMQ#handleMessage pass a client-controlled non-string pattern to JSON.stringify to derive the handler lookup key; sufficiently deep nesting throws RangeError: Maximum call stack size exceeded, and the unhandled promise rejection terminates Node.js under its default behavior. An attacker who can reach the TCP port or publish to the consumed RabbitMQ queue or exchange can crash the service on demand; other transports are not affected because their patterns arrive as strings. This issue is fixed in versions 11.2.4 and 12.0.2.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-102281 since 09/28/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 11.2.4 or 12.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• NestJS

Name

• Nest

Version

• 11.2.0
• 11.2.1
• 11.2.2
• 11.2.3
• 12.0.0
• 12.0.1

Website

• Product: https://github.com/nestjs/nest/

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