MAL-2026-5255

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/executable-stories-mcp/MAL-2026-5255.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-5255
Published
2026-06-05T00:53:43Z
Modified
2026-07-08T23:01:49.897385210Z
Summary
Malicious code in executable-stories-mcp (npm)
Details

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

Source: amazon-inspector (dc974c5748dbf6c421d343ec3924e31bcc8a56a1202e59818e5282bc239a14f2)

executable-stories-mcp@0.3.3 ships a bundled HTTP server module (dist/http.cjs and dist/http.js) where pattern matchers flagged co-occurrence of require("child_process"), POST/GET calls, and the literal string "ping". Behavioral tracing of the bundle did not complete, so it is not confirmed whether the GET/POST sites point at attacker-controlled destinations or at user-configured/MCP-protocol endpoints, nor whether "ping" is an executed shell command versus a string token (e.g., a healthcheck route name). The package is an MCP server, a class of tool that legitimately exposes HTTP routes and may shell out, so the keyword stack alone does not establish exfiltration. Routing to human review to inspect the bundle and confirm whether any hardcoded outbound destination or command-injection sink is present.

Source: google-open-source-security (a6c7977dbc054cdb7fe56da0d2fbd26e2a6fed695deb4263ccbf4adfedd86acb)

The Miasma malware is a self-propagating worm that spreads across the npm registry by abusing weaponized binding.gyp files to achieve execution during package installation, bypassing security tools that only inspect package lifecycle scripts. Upon execution, the malware attempts to exfiltrate credentials and OIDC tokens for various cloud and registry services, and propagates by compromising other packages managed by the stolen accounts or committing backdoor files to GitHub repositories.

Database specific
{
    "malicious-packages-origins": [
        {
            "sha256": "a6c7977dbc054cdb7fe56da0d2fbd26e2a6fed695deb4263ccbf4adfedd86acb",
            "import_time": "2026-06-05T05:50:37.549948Z",
            "versions": [
                "0.3.3"
            ],
            "source": "google-open-source-security",
            "modified_time": "2026-06-05T05:12:55.157000667Z"
        },
        {
            "versions": [
                "0.3.3"
            ],
            "import_time": "2026-07-08T22:51:14.646546605Z",
            "sha256": "dc974c5748dbf6c421d343ec3924e31bcc8a56a1202e59818e5282bc239a14f2",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-008738",
            "modified_time": "2026-07-08T22:26:02Z"
        }
    ]
}
References
Credits

Affected packages

npm / executable-stories-mcp

Package

Name
executable-stories-mcp
View open source insights on deps.dev
Purl
pkg:npm/executable-stories-mcp

Affected ranges

Affected versions

0.*
0.3.3

Database specific

cwes
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
indicators
{
    "evidence_files": [
        {
            "sha256": "963fe61fade31915661b511f9d5ddbad8220f46e6be36fce54a4656b088a1a47",
            "tlsh": "4132c75f14f9282042a392f5d11ac882b33961032015cc59ffdc97a02fee96ed1abfd9",
            "path": "dist/http.cjs"
        },
        {
            "sha256": "432c15343bbc58785726d030857cfabd4622254d6d71a71f078acfd245641c7a",
            "tlsh": "0b12956e24fe181082a3a2f1851ac48273356103651acd49fedc97506ffe97de1bbbd8",
            "path": "dist/http.js"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "f67d11b2e7be157ff61c60645e627a997f549b44",
                "sha512_sri": "sha512-5o9qjC2wGv2qyuk1+j4SVlbi81oM/0vo8Ir9cLUsSKmStZurcPB0O8+p1laVKufFv3dtBiAn+lavLfbEdRQ0Hg=="
            },
            "filename": "executable-stories-mcp-0.3.3.tgz"
        }
    ]
}
source
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/executable-stories-mcp/MAL-2026-5255.json"