MAL-2026-12976

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-markdown/MAL-2026-12976.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12976
Published
2026-08-05T14:42:16Z
Modified
2026-08-05T15:51:24.751717603Z
Summary
Malicious code in bnpl-blocks-markdown (npm)
Details

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

Source: amazon-inspector (161162281afaf68fd193e2521beaf60d32c850e29cc276192497eee09646a55a)

On require('bnpl-blocks-markdown'), index.js loads bootstrap.js which downloads a platform-specific binary from runtime-assembled Cloudflare Workers hosts (strings such as ['oob-worker.cf100-416.workers','.d','ev'].join('') and ['sdk.dl.','wel','1.r','u'].join('')), with a base64-over-DNS-TXT fallback channel via wel1.ru subdomains. The fetched bytes are written to /tmp or %TEMP% under disguised filenames mimicking system tools (e.g..cache<hex>, dotnetdiag<hex>.exe), chmod 0755'd, and spawned detached via /bin/sh -c or cmd. Env-var names DISABLETELEMETRY / ANALYTICSOPTOUT / DONOTTRACK and filenames like analyticsstate are cover-story framing; the package's advertised purpose is a markdown utility, which has no need to fetch and execute an arch-specific native binary from obfuscated hosts at import time. This is a classic import-time dropper with attacker-controlled code execution on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "161162281afaf68fd193e2521beaf60d32c850e29cc276192497eee09646a55a",
            "id": "IN-MAL-2026-015407",
            "modified_time": "2026-08-05T14:42:16Z",
            "import_time": "2026-08-05T15:19:49.700664251Z",
            "source": "amazon-inspector",
            "versions": [
                "35.4.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-markdown

Package

Name
bnpl-blocks-markdown
View open source insights on deps.dev
Purl
pkg:npm/bnpl-blocks-markdown

Affected ranges

Affected versions

35.*
35.4.1

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "834cb602f957e60dff714d018d6d5e1ba59a20d70cc84f7c0dceda63c2ea5001",
            "path": "_bootstrap.js",
            "tlsh": "9cb1965a166670184bb097f4c617541af65af6633380c194f79ca9981fb3624c3b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-aR32boYUkYwJ8349LJdnXa33lnxrcPmOT4l3KKBpcH4gYD7oL5AP/kJfyrkftBN5KLPh0axb5mc+qEGYerh9gA==",
                "sha1": "51c2c3e682aff7d85aa7913e4fe7c46f7ec312fd"
            },
            "filename": "bnpl-blocks-markdown-35.4.1.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/bnpl-blocks-markdown/MAL-2026-12976.json"