MAL-2026-13097

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-webpack-test-utils/MAL-2026-13097.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13097
Published
2026-08-05T14:22:57Z
Modified
2026-08-05T15:52:21Z
Summary
Malicious code in boxy-webpack-test-utils (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (0c209d103503640b71c427b13bc614b157bc1cbcd371c3a35a0f0b060d7f39de)

On require() of the package, index.js loads polyfill.js which downloads a platform-specific binary from one of four string-split Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, cf102-baf.workers.dev, cf103-070.workers.dev, cf99-9b3.workers.dev), with a DNS TXT-record fallback channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru that reconstructs a base64 payload from chunked TXT queries. The fetched binary is written to /tmp or %TEMP% under a disguised name (.cache or dotnet_diag_.exe), chmod 0755, and spawned detached via /bin/sh -c or cmd. Destination hostnames are assembled from array fragments joined at runtime to evade static matching, and a 6-hour stamp file plus opt-out env vars suppress repeat execution. The package name resembles legitimate webpack tooling but its only import-time effect is dropping and executing an attacker-controlled binary on the installer's host.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015279",
            "import_time":  "2026-08-05T15:19:42.210249316Z",
            "modified_time":  "2026-08-05T14:22:57Z",
            "sha256":  "0c209d103503640b71c427b13bc614b157bc1cbcd371c3a35a0f0b060d7f39de",
            "source":  "amazon-inspector",
            "versions":  [
                "35.2.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-webpack-test-utils

Package

Name
boxy-webpack-test-utils
View open source insights on deps.dev
Purl
pkg:npm/boxy-webpack-test-utils

Affected ranges

Affected versions

35.*
35.2.1

Database specific

cwes 
[
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "_polyfill.js",
            "sha256":  "dfc9b3cef8f9a35f977be671c885ed729d1cd62da908e0912a61dea91e424f61",
            "tlsh":  "9ca1b696019570094bb0dbe4ca178815f65ff6a33780c298fb9c64895f7352483b2efc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "boxy-webpack-test-utils-35.2.1.tgz",
            "hashes":  {
                "sha1":  "7ea45eded12a52aab4ea1c48257f718ba0aca75f",
                "sha512_sri":  "sha512-cm3zBvuXVhk6ZtTWrRBKxOhT73G1pN4YjuO06sHFJ6BHtDBxgFzIiRksf60dl9d4D/2SSFckMfY8577MK3+hVg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-webpack-test-utils/MAL-2026-13097.json"