MAL-2026-5481

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mcp-server-postgres/MAL-2026-5481.json
JSON Data
https://api.test.osv.dev/v1/vulns/MAL-2026-5481
Published
2026-06-09T20:34:49Z
Modified
2026-06-12T20:01:43.759089645Z
Summary
Malicious code in mcp-server-postgres (npm)
Details

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

Source: amazon-inspector (f0b86cc4cf49b5d6cda37126f6a0c7c9f9fec648eb4d4743b6f39423613d3122)

Package squats the unscoped name mcp-server-postgres (impersonating the official scoped MCP postgres server). package.json declares "postinstall": "node index.js", which fires unconditionally on npm install. index.js loads os, https, and http, then POSTs a JSON body containing os.hostname(), process.cwd(), the npm user-agent, Node version, and os.platform() to a hardcoded Cloudflare Workers endpoint at https://npx-canary-log.vulnerable-live.workers.dev/log. Installers and CI systems running npm install or npx mcp-server-postgres leak host identifiers and working-directory paths to a third-party endpoint without consent. Although the author self-describes the package as a 'canary' for npx-confusion research, the typosquat name combined with unsolicited install-time host telemetry exfiltration constitutes a supply-chain attack against installers.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-06-09T20:34:49Z",
            "source": "amazon-inspector",
            "sha256": "6c4d1fa0d6fdf2966637bf91c161f3c063aa675eeca88bd0f9abf002c51070c6",
            "id": "IN-MAL-2026-005231",
            "versions": [
                "0.0.1"
            ],
            "import_time": "2026-06-09T20:45:57.509546196Z"
        },
        {
            "modified_time": "2026-06-09T20:34:50Z",
            "source": "amazon-inspector",
            "sha256": "ee78fcc5f02c57d736d4788fc916c776b9db61a18edad8291254ad697763f597",
            "id": "IN-MAL-2026-005232",
            "import_time": "2026-06-09T20:45:57.599849438Z",
            "versions": [
                "0.0.1"
            ]
        },
        {
            "modified_time": "2026-06-12T19:07:29Z",
            "source": "amazon-inspector",
            "sha256": "083002f0c966dc86b847b4a40733a705c82249bbdad0d7f3fef8861f58f983f1",
            "id": "IN-MAL-2026-006022",
            "import_time": "2026-06-12T19:43:59.235102535Z",
            "versions": [
                "0.0.2"
            ]
        },
        {
            "modified_time": "2026-06-12T19:07:27Z",
            "source": "amazon-inspector",
            "sha256": "f0b86cc4cf49b5d6cda37126f6a0c7c9f9fec648eb4d4743b6f39423613d3122",
            "id": "IN-MAL-2026-006019",
            "import_time": "2026-06-12T19:43:58.903981438Z",
            "versions": [
                "0.0.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / mcp-server-postgres

Package

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

Affected ranges

Affected versions

0.*
0.0.1
0.0.2

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mcp-server-postgres/MAL-2026-5481.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "mcp-server-postgres-0.0.1.tgz",
            "hashes": {
                "sha512_sri": "sha512-IxhzDulWucT/bRAY4fo07EpNfusWdSz1iCwmawMrlUeIJXbovHCwDa8qq04xY2w8EYWvE/SjiCIbyl6PuqVS2Q==",
                "sha1": "619d5e7a8cf71d7cbf29b260f406442286c4935f"
            }
        }
    ],
    "evidence_files": [
        {
            "sha256": "7e44b21be634b28a9772004faf455a933349127afe559353d0e7e61dccdbbb7b",
            "tlsh": "6c3195e180f805351fee46d3e2e9a899a36ff126360778f0b49e02295fc90980771cd2",
            "path": "index.js"
        }
    ],
    "domains": [
        "npx-canary-log.vulnerable-live.workers.dev"
    ]
}