---
id: "MAL-2026-17629"
kind: "package"
aliases: ["MAL-2026-17629"]
title: "Malicious code in zencleaner (PyPI)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "zencleaner", "fixed": [], "affected": "= 1.0.0; = 1.0.3; = 1.0.3.1", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-03T22:47:45+00:00"
first_seen_at: "2026-10-26T20:51:59+00:00"
updated_at: "2026-10-26T21:08:21+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-17629", "first_seen_at": "2026-10-26T20:51:59+00:00"}]
---

# Malicious code in zencleaner (PyPI)

## Affected

- pypi:zencleaner affected = 1.0.0; = 1.0.3; = 1.0.3.1 fixed ?

## Timeline

- 2026-10-26T20:51:59+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-17629

## From the sources

When a license key is activated or deactivated in the local UI, zencleaner/webhook_logger.py posts the key, the PC name, the Windows user name and the client IP to a hardcoded Discord webhook, although the README says nothing is sent to the internet. 1.0.3 and 1.0.3.1 also look up the public IP through ipify.org and ifconfig.me. Separately, cleaner_system.py clears the Windows event logs, Security included, with wevtutil; a comment in that function reads "so forensic scanners report 0 entries". Nothing runs at install time. I read all three versions and did not run them.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_