# MAL-2026-4288: Malicious code in @jaggle/resizeobserves (npm)


- **Type:** Malicious package
- **Package:** `@jaggle/resizeobserves` (npm)
- **Published:** 21 May 2026
- **Also known as:** GHSA-qc6p-vxcj-7r4h

## What is MAL-2026-4288?

MAL-2026-4288 is a malicious package in @jaggle/resizeobserves, published on 21 May 2026. 

### Official description

Package name impersonates the popular @juggle/resize-observer (j→j substitution and pluralized 'resizeobserves') and the README is copied verbatim from the legitimate package, but the tarball ships an unrelated Python module (clipboard_guardian) that has nothing to do with a ResizeObserver polyfill. The postinstall hook (npm-install.cjs) bootstraps Python and pip on the installer's machine — attempting privileged installs via sudo -n / pkexec apt-get / pacman / dnf, falling back to fetching get-pip.py from bootstrap.pypa.io — then runs `pip install --break-system-packages` on the bundled clipper, and finally writes a persistent autostart entry under a disguised name: a systemd user unit `python3-dbus-helper.service` on Linux, a `com.apple.python.runtime.plist` LaunchAgent on macOS, or an `HKCU\...\Run\PyRuntimeBroker` value on Windows. Once running, clipboard_guardian/guardian.py monitors the user's clipboard, matches outgoing content against regexes for 40+ blockchains, and silently replaces any detected wallet address with one of the attacker's hardcoded wallets (e.g., ethereum 0x450c0E58Fc2ba03632d3F5780ad8C966648B6F18, bitcoin bc1qs2mpls4p0f7fng073gy2rcdgjpf7la4eugpt6y, plus monero/etc.) — any crypto payment the victim copies is redirected to the attacker. The daemon further disguises itself via setproctitle('python3-dbus-helper' / 'com.apple.python.runtime') and SetConsoleTitleW('Python Runtime Broker') to blend with OS components, ships an `anti-clipper` cover story in pyproject.toml while being the clipper itself, and contains an is_monitor_running() routine that pauses substitution when task managers / process explorers (taskmgr, procexp, procmon, ProcessHacker, Activity Monitor, htop, btop, gnome-system-monitor, etc.) are detected. The combination of typosquat naming, install-time privileged persistence, hardcoded attacker wallets, and explicit anti-analysis logic makes intent unambiguous.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

The OpenSSF Package Analysis project identified '@jaggle/resizeobserves' @ 1.0.11 (npm) as malicious.

It is considered malicious because:

- The package executes one or more commands associated with malicious behavior.

## What should I do about MAL-2026-4288?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-4288 is a malicious package: @jaggle/resizeobserves (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-4288/ (Markdown: https://insights.sbomify.com/MAL-2026-4288/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4288

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-4288/
Summaries are generated and may contain mistakes; the official description above is the record.