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Malicious code in zencleaner (PyPI)

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI zencleaner

    Affected
    >= 1.0.0, <= 1.0.0>= 1.0.3, <= 1.0.3>= 1.0.3.1, <= 1.0.3.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

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. --- _-= Per source details. Do not edit below this line.=-_

Source: amazon-inspector (b619bf84ab0ccce9d7a00ee6cafa8f950e8591e2664f8d11d73baf2c8adcbaf5) zencleaner 1.0.3.1 advertises itself as a fully local Windows cleaner bound to 127.0.0.1 with 'no telemetry, no data collection, no outbound calls'. In practice, the local web server's license activate/deactivate handler calls a webhook_logger that POSTs the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from osv record MAL-2026-17629

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: mal-2026-17629

Advisory: Malicious code in zencleaner (PyPI)
IDs: mal-2026-17629
Record: https://patchnext.com/advisories/mal-2026-17629 (revision 1, source checked 30 Oct 2026, 06:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI zencleaner: affected >= 1.0.0, <= 1.0.0; >= 1.0.3, <= 1.0.3; >= 1.0.3.1, <= 1.0.3.1

## Suggested inspection (read-only)
- `python -m pip show zencleaner`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on zencleaner.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/MAL-2026-17629 (OSV record MAL-2026-17629 lists affected ranges: PyPI zencleaner >=1.0.0 =1.0.3 =1.0.3.1 <=1.0.3.1)

Commands are suggestions: review each one before running it.

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