🛡️ MAL-2026-12641 — claims-replace-url-params

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

Description

Malicious code in claims-replace-url-params (npm)

Source: amazon-inspector

The package's public API in index.js is a no-op class whose only real effect is require("./_adapter") on load. _adapter.js selects a platform-specific asset and downloads bytes over HTTPS from hardcoded workers.dev hosts (oob-worker.cf101-adf.workers.dev) with a DNS-TXT fallback that assembles base64 chunks from *.dl.wel1.ru subdomains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched bytes are written to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start. Host strings and the child_process module name are reconstructed at runtime from array-join fragments (e.g. ["oob-worker.cf","101-adf",".worke","rs.d","ev"].join(""), require("child_" + "process")) to defeat static string matching. lib/telemetry.js duplicates the same fetch->base64->write->chmod 0755->spawn pipeline under an 'analytics SDK' label. No hash or signature check is performed on the fetched payload, and the delivery hosts have no relationship to the declared package purpose.

Affected software

MAL-2026-12641 is recorded against 1 package.

  • claims-replace-url-params

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-replace-url-params — —

Free Vulnerability Check

Is your site affected by MAL-2026-12641?

BotEraser helps you identify potentially vulnerable plugins and themes by checking your installation against MAL-2026-12641 and other known CVE records.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.