#malicious-npm-package

#malicious-npm-package

"The sample retains Shai-Hulud hallmarks and adds GitHub API exfiltration with DNS fallback, hook-based persistence, SSH propagation fallback, MCP server injection with embedded prompt injection targeting AI coding assistants, and LLM API Key harvesting," the company said. The packages, published to npm by two npm publisher aliases, official334 and javaorg, are listed below - Also identified are four sleeper packages that do not incorporate any malicious features -

Researchers have discovered that a compromised npm publish token pushed an update for the widely-used Cline command line interface (CLI) containing a malicious postinstall script. That script installs the wildly popular, but increasingly condemned, agentic application OpenClaw on the unsuspecting user's machine. This can be extremely dangerous, as OpenClaw has broad system access and deep integrations with messaging platforms including WhatsApp, Telegram, Slack, Discord, iMessage, Teams, and others.

saving lockfile integrity checks (package-lock.json, pnpm-lock.yaml, and others) to version control (git). The lockfile records the exact version and integrity hash of every package in a dependency tree. On subsequent installs, the package manager checks incoming packages against these hashes, and if something doesn't match, installation fails. If an attacker compromises a package and pushes a malicious version, the integrity check should catch the mismatch and block it from being installed.

NCryptYo is a stage-1 execution-on-load dropper. When the assembly loads, its static constructor installs JIT compiler hooks that decrypt embedded payloads and deploy a stage-2 binary - a localhost proxy on port 7152 that relays traffic between the companion packages and the attacker's external C2 server, whose address is resolved dynamically at runtime.

Attackers are actively exploiting a critical vulnerability in React Native's Metro server to infiltrate development environments. The vulnerability, CVE-2025-11953, allows malicious actors to execute code on Windows and Linux systems via exposed development servers. Metro is React Native's default JavaScript bundler during application development and testing. In many configurations, this server runs locally, but by default, Metro can also bind to external network interfaces. This makes HTTP endpoints available that are intended for development. It is precisely this functionality that now constitutes an attack vector,

The vulnerability, tracked as CVE-2026-1245 (CVSS score: N/A), affects all versions of the module prior to version 2.3.0, which addresses the issue. Patches for the flaw were released on November 26, 2025. Binary-parser is a widely used parser builder for JavaScript that allows developers to parse binary data. It supports a wide range of common data types, including integers, floating-point values, strings, and arrays. The package attracts approximately 13,000 downloads on a weekly basis.

Cybersecurity company VulnCheck said it first observed exploitation of CVE-2025-11953 (aka Metro4Shell) on December 21, 2025. With a CVSS score of 9.8, the vulnerability allows remote unauthenticated attackers to execute arbitrary operating system commands on the underlying host. Details of the flaw were first documented by JFrog in November 2025. Despite more than a month after initial exploitation in the wild, the "activity has yet to see broad public acknowledgment," it added.