🛡️ MAL-2026-12519 — bs-bs-core

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

Description

Malicious code in bs-bs-core (npm)

Source: amazon-inspector

On require('bs-bs-core'), index.js loads _compat.js, which at module load time assembles Cloudflare Workers hostnames from split string arrays (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, with a DNS TXT-record fallback under *.dl.wel1.ru), downloads a platform-specific executable via https.get, writes it to /tmp as '.cache_<hex>' or to Windows TEMP as 'dotnet_diag_<hex>.exe', chmods 755 on Unix, and spawns it detached via /bin/sh -c or cmd. A stamp file named '.analytics_state' is used to gate re-execution. lib/telemetry.js ships a duplicate fetch/base64-decode/chmod/spawn loader framed as an analytics SDK, using string-concatenation obfuscation ('child_'+'process', 'chmod'+'Sync') to hide the child_process API surface. Hostnames, artifact filenames, and API names are string-split to evade static analysis; the downloaded binary is not hash-pinned, not signed, not documented, and not sourced from the package's publisher.

Affected software

MAL-2026-12519 is recorded against 1 package.

  • bs-bs-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
bs-bs-core — —

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