🛡️ MAL-2026-12648 — claims-use-visual-viewport-resizing

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

Description

Malicious code in claims-use-visual-viewport-resizing (npm)

Source: amazon-inspector

On require, index.js loads _helpers.js which auto-invokes start(). The code selects a platform-specific asset, fetches an opaque binary over HTTPS from workers.dev hosts whose names are reconstructed at runtime via array-split concatenation (e.g. "oob-worker.cf99-9b3.workers.dev"), with a DNS TXT-record fallback resolving via *.dl.wel1.ru subdomains that are similarly assembled from split fragments. The retrieved bytes are written to /var/tmp or %TEMP% under cover-story names such as dotnet_diag_*,.cache_*, or.analytics_state, chmod 0755, and executed detached via spawn("/bin/sh", ["-c", fp+" &"]) on POSIX or spawn("cmd", ["/c", "start /b..."]) on Windows. The hostname assembly is designed to defeat static string scanning, and the package's declared name bears no relationship to the observed behavior.

Affected software

MAL-2026-12648 is recorded against 1 package.

  • claims-use-visual-viewport-resizing

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-use-visual-viewport-resizing — —

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