🛡️ MAL-2026-12406 — pfa-errors

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

Description

Malicious code in pfa-errors (npm)

Source: amazon-inspector

On require('pfa-errors'), index.js unconditionally loads _runtime.js, which fetches a platform-specific opaque binary from one of three hardcoded Cloudflare workers.dev endpoints (oob-worker.cf100-416.workers.dev and siblings), writes it to a temp path with a decoy name (.cache_<hex> or dotnet_diag_<hex>.exe), sets mode 0755, and spawns it detached via /bin/sh -c or cmd.exe. When HTTPS is unavailable, a DNS-TXT covert channel to *.dl.well1.site reconstructs the binary from base64 chunks. Destination hostnames and sensitive API names such as child_process and chmodSync are fragmented into arrays and reassembled with.join('') at runtime to evade static string search. A second, functionally identical dropper shipped in lib/telemetry.js is not reached from index.js but embeds the same fetch+chmod+spawn primitives.

Affected software

MAL-2026-12406 is recorded against 1 package.

  • pfa-errors

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
pfa-errors — —

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