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Malicious code in my-empty-package (npm)

GHSA-39q9-338w-8vhv

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

  • npm my-empty-package

    Affected
    >= 1.0.0, <= 1.0.0
    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.

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

Source: amazon-inspector (914ffc98ce1f6553e4f9655208318800d0d22663842eb4c9a3d0d51d4f143bdd) package.json declares `postinstall: node index.js`. On `npm install`, index.js branches on `os.platform()` and executes platform-specific shell commands: `osascript` on macOS, `powershell -WindowStyle Hidden -EncodedCommand ` on Windows, and `python3 -c 'os.system(...)'` on Linux. After the payload runs, a cleanup step renames a shipped `package.md` over `package.json` and unlinks `index.js` itself, removing the install-time script from disk and presenting a different manifest to any post-install inspection. The hidden-window base64-encoded PowerShell invocation is a standard malware evasion technique. Manifest swap + entrypoint self-deletion is anti-forensic behavior with no legitimate purpose. Even though the current payload body is a benign demonstration (opens the calculator), the delivery framework is a fully-functional…

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

    Published from osv record MAL-2026-10535

Agent brief

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

# Patch Next advisory brief: GHSA-39q9-338w-8vhv

Advisory: Malicious code in my-empty-package (npm)
IDs: GHSA-39q9-338w-8vhv
Record: https://patchnext.com/advisories/mal-2026-10535 (revision 1, source checked 29 Oct 2026, 06:00 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
- npm my-empty-package: affected >= 1.0.0, <= 1.0.0

## Suggested inspection (read-only)
- `npm ls my-empty-package --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## 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 my-empty-package.
- 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-2026-10535 (OSV record MAL-2026-10535 lists affected ranges: npm my-empty-package >=1.0.0 <=1.0.0)

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