MAL-2026-4365

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/withdrawn/npm/@atlisp/mcp/MAL-2026-4365.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-4365
Withdrawn
2026-05-26T21:14:22Z
Published
2026-05-21T03:48:09Z
Modified
2026-05-27T00:32:01Z
Summary
Malicious code in @atlisp/mcp (npm)
Details

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

Source: amazon-inspector (c5f4a9667f0a13220de9b838fde4fc16bd5aaa7f79d91f1122725e4799582515)

The package's MCP server auto-injects a LISP bootstrap into every CAD command sent through cadSend/cadSendWithResult, plus connect_cad's initAtlisp and install_atlisp. The bootstrap creates a WinHTTP request to http://atlisp.cn/cloud (plain HTTP) and passes the response body directly to (eval (read...)) inside the user's running CAD process. The URL is assembled via strcat string concatenation (e.g., (s "win" h ".win" h "request.5.1") and (s h"://""atlisp.""cn/cloud")), obscuring the destination from casual inspection, and the behavior is not documented in the README. Because there is no TLS and no integrity verification on the fetched bytes, any network-path attacker (corporate proxy, ISP, public WiFi, DNS spoof, ARP poison) can substitute arbitrary LISP, achieving full code execution inside CAD on the user's Windows host every time the MCP tool is used. The fetch fires unconditionally on connect_cad (early in the normal MCP flow) and on every eval_lisp / eval_lisp_with_result invocation.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-003716",
            "import_time": "2026-05-26T05:51:10.381106206Z",
            "modified_time": "2026-05-21T03:48:09Z",
            "sha256": "c5f4a9667f0a13220de9b838fde4fc16bd5aaa7f79d91f1122725e4799582515",
            "source": "amazon-inspector",
            "versions": [
                "1.6.10"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @atlisp/mcp

Package

Name
@atlisp/mcp
View open source insights on deps.dev
Purl
pkg:npm/%40atlisp%2Fmcp

Affected ranges

Affected versions

1.*
1.6.10

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": "dist/cad-worker.js",
            "sha256": "52661e97093449503cf2633cf51fdafd28552cc912bba9a84a05d7b631fe8436",
            "tlsh": "85a2745519f348694273303aabcf8405b23796036569eeb9bdcd4380af91a7817f2bf4"
        },
        {
            "path": "dist/atlisp-mcp.js",
            "sha256": "ef32173248382cde53166e294973456e86c0444f2bc6284d339a54e96e2db4ff",
            "tlsh": "b964a54d69fa243112a7b0795d1b5516b330e20b621cecb6faecc3746f580a4d5f2bac"
        }
    ],
    "package_integrity": [
        {
            "filename": "mcp-1.6.10.tgz",
            "hashes": {
                "sha1": "a5f6266634af7560186b590f8d957a6564b2fa56",
                "sha512_sri": "sha512-utPe6EFSokP4ETXws1GX7dFAd5Q52CBF82sH9draamJoM8rGCzlJbrjMvAiWFInhqmXJQdhN6ruQ1+1DF5MRpw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/withdrawn/npm/@atlisp/mcp/MAL-2026-4365.json"