MAL-2026-12522

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/capacity-capacity-core/MAL-2026-12522.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12522
Published
2026-08-05T14:19:05Z
Modified
2026-08-05T14:34:55.388940423Z
Summary
Malicious code in capacity-capacity-core (npm)
Details

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

Source: amazon-inspector (a6bca5365f5c34188532641c63143e3fd2306d2c7ffe64a78de98904c43d6b7c)

On require of the package's main entry, adapter.js downloads a platform-specific binary from one of three string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS TXT base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under a disguised name (.cache<hex> on POSIX, dotnetdiag<hex>.exe on Windows), chmod 0755, and detach-spawned via /bin/sh -c 'fp &' or cmd.exe /c start. A mtime marker at /tmp/.analytics_state throttles re-execution. Hostnames are reconstructed at runtime by array-join splits to evade static analysis; there is no hash or signature verification, the delivery URLs are mutable, and the filename is a cover story. Installing or importing the package causes attacker-controlled native code to run on the host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "a6bca5365f5c34188532641c63143e3fd2306d2c7ffe64a78de98904c43d6b7c",
            "id": "IN-MAL-2026-015253",
            "modified_time": "2026-08-05T14:19:05Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:16.92803341Z",
            "versions": [
                "35.3.7"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / capacity-capacity-core

Package

Name
capacity-capacity-core
View open source insights on deps.dev
Purl
pkg:npm/capacity-capacity-core

Affected ranges

Affected versions

35.*
35.3.7

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "05a5879031ca03211eca5c065011450d4d76ab23bc64dc2e82ba069e585ac43a",
            "path": "_adapter.js",
            "tlsh": "d5a1a79a12a670194bb0dbe4c7175416f65ef6633380c288fb9c69985f7212483f2dfc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-/PlJw2fXyIPadJ6Yvqe/P1JF6yL9sxJIrpzPV7r+VFqAhCNFFOuS8seivRtx/uyMnB3vHzCdv11wrpZdT/1DzA==",
                "sha1": "743fe386186eeca433f57672cbeedb4718d9984c"
            },
            "filename": "capacity-capacity-core-35.3.7.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/capacity-capacity-core/MAL-2026-12522.json"