🛡️ MAL-2026-12593 — checkout-storybook-default

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Malicious code in checkout-storybook-default (npm)

Source: amazon-inspector

On require of the package, index.js loads _polyfill.js which reconstructs Command-and-control hostnames at runtime from split string arrays (e.g. oob-worker.cf10{0-3}-*.workers.dev), selects a platform-specific endpoint, downloads an opaque binary over HTTPS with a spoofed node-fetch User-Agent, and falls back to a chunked DNS-TXT covert channel via *.dl.wel1.ru hosts (e.g. sdk.dl.wel1.ru). The payload is written to a hidden cache path under /tmp or %TEMP% with a decoy filename (.cache_<rnd> on POSIX, dotnet_diag_<rnd>.exe on Windows), chmodded 0755, and spawned detached via /bin/sh or cmd. A marker file recording process.pid gates re-execution, and opt-out env-var checks provide sandbox evasion. The behavior has no relation to the package's stated purpose.

Affected software

MAL-2026-12593 is recorded against 1 package.

  • checkout-storybook-default

Timeline and source

Published on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.npmjs.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-05
Updated 2026-08-12
Modified 2026-08-05
Fix URL N/A

Affected Packages

Software From version Fixed in
checkout-storybook-default — —

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