🛡️ MAL-2026-12420 — prokit-core

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

Description

Malicious code in prokit-core (npm)

Source: amazon-inspector

On require of the package, index.js unconditionally loads _helpers.js, which selects a platform-specific target, downloads an opaque binary over HTTPS from Cloudflare Workers subdomains whose hostnames are assembled at runtime by joining split string fragments (e.g. oob-worker.cf101-adf.workers.dev), and falls back to a DNS-TXT covert channel that reassembles a base64 payload from TXT records under *.dl.well1.site (tin.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site, tina.dl.well1.site). The retrieved bytes are written to /var/tmp or %TEMP% under a disguised name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe. A /tmp/.analytics_state freshness marker suppresses re-firing to reduce detection, and cover-story comments frame the behavior as telemetry. Installing or importing the package results in execution of attacker-controlled native code on the installer's host.

Affected software

MAL-2026-12420 is recorded against 1 package.

  • prokit-core

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
prokit-core — —

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