Malicious code in fastify-client-bundler (npm)
The npm package fastify-client-bundler version 1.4.0 contains malicious code that fetches and executes remote code from a hardcoded IP address. This remote code execution occurs via a function that compiles and runs JavaScript obtained from the endpoint, enabling arbitrary code execution in the Node.js process. The package's declared functionality is a decoy, while the actual behavior includes loading dependencies consistent with a Windows credential and wallet stealer. No official patch or remediation information is provided, and no known exploits in the wild have been reported.
AI Analysis
Technical Summary
The fastify-client-bundler npm package version 1.4.0 includes a getPlugin() function that retrieves JSON data from a hardcoded bare-IP HTTPS endpoint (31.97.137.157:45000). It extracts the 'credits' field from the response and compiles it into executable code using new Function(), injecting Node.js globals such as require, module, exports, process, Buffer, and Promise. This allows the remote endpoint to execute arbitrary code within the Node.js process that loads the package. The package's stated purpose as a Fastify client bundler and CDN helper functions are unused decoys. The bundled runtime dependencies (@primno/dpapi, better-sqlite3, node-machine-id) suggest the payload is designed to steal Windows credentials and wallets. There is no vendor advisory or patch information available.
Potential Impact
Successful exploitation results in arbitrary code execution within the Node.js process using the fastify-client-bundler package. This can lead to credential theft and wallet compromise on Windows systems due to the presence of dependencies associated with such malicious activities. The malicious code is remotely controlled via a hardcoded IP address, allowing an attacker to deliver payloads dynamically.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid using fastify-client-bundler version 1.4.0 or any untrusted versions. Remove the package from projects and replace it with a trusted alternative. Monitor for updates from the package maintainer or npm security advisories.
Malicious code in fastify-client-bundler (npm)
Description
The npm package fastify-client-bundler version 1.4.0 contains malicious code that fetches and executes remote code from a hardcoded IP address. This remote code execution occurs via a function that compiles and runs JavaScript obtained from the endpoint, enabling arbitrary code execution in the Node.js process. The package's declared functionality is a decoy, while the actual behavior includes loading dependencies consistent with a Windows credential and wallet stealer. No official patch or remediation information is provided, and no known exploits in the wild have been reported.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The fastify-client-bundler npm package version 1.4.0 includes a getPlugin() function that retrieves JSON data from a hardcoded bare-IP HTTPS endpoint (31.97.137.157:45000). It extracts the 'credits' field from the response and compiles it into executable code using new Function(), injecting Node.js globals such as require, module, exports, process, Buffer, and Promise. This allows the remote endpoint to execute arbitrary code within the Node.js process that loads the package. The package's stated purpose as a Fastify client bundler and CDN helper functions are unused decoys. The bundled runtime dependencies (@primno/dpapi, better-sqlite3, node-machine-id) suggest the payload is designed to steal Windows credentials and wallets. There is no vendor advisory or patch information available.
Potential Impact
Successful exploitation results in arbitrary code execution within the Node.js process using the fastify-client-bundler package. This can lead to credential theft and wallet compromise on Windows systems due to the presence of dependencies associated with such malicious activities. The malicious code is remotely controlled via a hardcoded IP address, allowing an attacker to deliver payloads dynamically.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid using fastify-client-bundler version 1.4.0 or any untrusted versions. Remove the package from projects and replace it with a trusted alternative. Monitor for updates from the package maintainer or npm security advisories.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12379
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a735743bf8831d539159c47
Added to database: 08/05/2026, 15:31:15 UTC
Last enriched: 08/05/2026, 17:16:28 UTC
Last updated: 08/05/2026, 17:16:28 UTC
Views: 2
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