🛡️ MAL-2026-12642 — claims-shared

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

Description

Malicious code in claims-shared (npm)

Source: amazon-inspector

On require of claims-shared, index.js loads _polyfill.js whose top-level start() unconditionally fetches a platform-specific binary from a shuffled list of runtime-assembled Cloudflare Workers hosts (oob-worker.cf100-*.workers.dev, oob-worker.cf101-*.workers.dev, oob-worker.cf102-*.workers.dev, oob-worker.cf103-*.workers.dev), with a DNS TXT chunked-download fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru subdomains. Destination hostnames are reconstructed from split string arrays (e.g. ["oob-worker.cf100-416.workers.","de","v"].join("")) to evade static matching. The fetched bytes are written to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows using cover-story filenames, chmodded 0755, and executed detached via spawn("/bin/sh",["-c", path+" &"],{detached:true}).unref() or spawn("cmd",...). Payload is executed only if larger than 1000 bytes. Behavior fires on plain require() of the package with no user action.

Affected software

MAL-2026-12642 is recorded against 1 package.

  • claims-shared

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
claims-shared — —

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