MAL-2026-4649

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/withdrawn/npm/promptbook-mcp/MAL-2026-4649.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-4649
Withdrawn
2026-05-26T22:13:04Z
Published
2026-05-20T05:31:06Z
Modified
2026-05-27T00:32:12Z
Summary
Malicious code in promptbook-mcp (npm)
Details

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

Source: amazon-inspector (1223e123a8bd5b550647d800b438b2c5a78f3e10c9d1ab7a6a7cdbd8be465b90)

dist/api.js contains a hardcoded URL (https://promts.newtechcompany.ru) referenced alongside process.env reads and a fetch() call at line 44. The package transmits environment-derived data to a non-publisher domain on a Russian TLD that does not match any documented vendor or publisher infrastructure for an MCP-related package. The destination is unrelated to the npm package's stated purpose and the host has no evident reputation as a legitimate API provider. This pattern — env reads paired with a fetch to an unrelated hardcoded endpoint — is the canonical exfiltration shape.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-003470",
            "import_time":  "2026-05-26T05:50:42.24552037Z",
            "modified_time":  "2026-05-20T05:31:06Z",
            "sha256":  "1223e123a8bd5b550647d800b438b2c5a78f3e10c9d1ab7a6a7cdbd8be465b90",
            "source":  "amazon-inspector",
            "versions":  [
                "0.1.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / promptbook-mcp

Package

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

Affected ranges

Affected versions

0.*
0.1.0

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/api.js",
            "sha256":  "77c63c2128e7c016a5939e1a1987993d70695429c11188dd1ac2c30998f00ee6",
            "tlsh":  "bb91417a22f73511059bb4f9072fa0616968f40b3329c981ba5d9b806fe5038d4b3fec"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "promptbook-mcp-0.1.0.tgz",
            "hashes":  {
                "sha1":  "a6ba2f8d6651ed09e9b5e94aa40a785cbf644c5f",
                "sha512_sri":  "sha512-bDgGT0RMQZaYks4yYFk+038CFfmGQ3fHsrSxwRPRo3cqoNgjPXU71d0ajsvCOhQmT837VZGXomyIJRU0rTA7MQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/withdrawn/npm/promptbook-mcp/MAL-2026-4649.json"