MAL-2026-1288 Malicious code in arnavtest123 (PyPI)
Malicious package
Published
MAL-2026-1288 is a malicious package: arnavtest123 (PyPI). 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-2026-1288/ (Markdown: https://insights.sbomify.com/MAL-2026-1288/index.md)
- Package
- arnavtest123
- Registry
- PyPI
What is MAL-2026-1288?
MAL-2026-1288 is a malicious package in arnavtest123, published on 8 Mar 2026.
Official description
During installation, the package starts a reverse shell
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-02-jwrincident
Reasons (based on the campaign):
- The package contains code to create a reverse shell, allowing an attacker to execute any commands on the victim's machine.
What should I do about MAL-2026-1288?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.