🛡️ MAL-2026-12480 — tms-x-headers

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

Description

Malicious code in tms-x-headers (npm)

Source: amazon-inspector

On require() of the package, _helpers.js fetches a platform-specific binary from hostnames assembled by concatenating string fragments (oob-worker.cf101-adf.workers.dev and sibling cf103-070 / cf100-416 workers.dev hosts), with a DNS-TXT fallback channel resolved through fragment-joined *.dl.well1.site names. The fetched bytes are written to a temp file with a cover-story name (dotnet_diag_<hex>.exe on Windows,.cache_<hex> on Unix), chmod 0755, and spawned detached via cmd.exe /c start or /bin/sh -c with no hash or signature verification. The child_process module is also required via a split string ("child_" + "process") in lib/telemetry.js. The destination hosts are not the package publisher, are deliberately fragmented to evade static string matching, and the temp filename mimics legitimate.NET diagnostics tooling. Installing or loading the package therefore runs attacker-controlled native code on the installer's host.

Affected software

MAL-2026-12480 is recorded against 1 package.

  • tms-x-headers

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
tms-x-headers — —

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