Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Unrated

Malicious code in zystcdemo (npm)

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.

Add to your agent

Affected packages

  • npm zystcdemo

    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.

zystcdemo presents itself as a simple date formatting utility and runs its postinstall payload on npm install with `node postinstall.js`. The payload collects the `whoami` result, hostname, platform, and current time, then sends them in a POST request to `https://srctest.zystcc.cn/collect`; npm account `zyst` published it on 2026-10-29 (UTC).

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

    Published from osv record MAL-2026-18447

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-2026-18447

Advisory: Malicious code in zystcdemo (npm)
IDs: mal-2026-18447
Record: https://patchnext.com/advisories/mal-2026-18447 (revision 1, source checked 2 Nov 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 zystcdemo: affected >= 1.0.0, <= 1.0.0

## Suggested inspection (read-only)
- `npm ls zystcdemo --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 zystcdemo.
- 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-2026-18447 (OSV record MAL-2026-18447 lists affected ranges: npm zystcdemo >=1.0.0 <=1.0.0)

Commands are suggestions: review each one before running it.

Loading voting…