MAL-2026-6791

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/npm-show-date-proof-strings/MAL-2026-6791.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-6791

Published

2026-07-01T16:11:17Z

Modified

2026-07-09T23:02:02Z

Summary

Malicious code in npm-show-date-proof-strings (npm)

Details

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

Source: amazon-inspector (884f2797ddf6247c906bb97e72b3c0891551b260980811d50c7211ab2ea0bbcf)

The package's postinstall.js runs on every npm install and collects the installer's username (via whoami and os.userInfo()), hostname (os.hostname()), platform (process.platform), and Node version, then transmits them as query parameters via https.get() to a hardcoded endpoint at https://testnpm.byte.eyes.sh/npm-proof. The destination is author-controlled and undocumented; the installer has no opportunity to opt out. The package name ("npm-show-date-proof-strings") and an embedded NONCE string ("proof-2026-change-this-random-string") indicate this is a proof-of-execution beacon, but regardless of framing, it is unconsented host-identifier collection on install with no legitimate installer-facing purpose.

Source: ossf-package-analysis (a2ca450bd74580e87a2f428fd6fcfe66ac30e7a2a88e214da7d3628915549db6)

The OpenSSF Package Analysis project identified 'npm-show-date-proof-strings' @ 1.0.3 (npm) as malicious.

It is considered malicious because:

The package executes one or more commands associated with malicious behavior.

Database specific

{
    "malicious-packages-origins": [
        {
            "import_time": "2026-07-05T23:26:10.510573376Z",
            "modified_time": "2026-07-01T16:11:17Z",
            "sha256": "a2ca450bd74580e87a2f428fd6fcfe66ac30e7a2a88e214da7d3628915549db6",
            "source": "ossf-package-analysis",
            "versions": [
                "1.0.3"
            ]
        },
        {
            "id": "IN-MAL-2026-009370",
            "import_time": "2026-07-09T17:19:30.155196483Z",
            "modified_time": "2026-07-09T17:02:23Z",
            "sha256": "2d30ee041cbe9a4b74e08cc0e493901460cc6563874723f620160c73908ed88a",
            "source": "amazon-inspector",
            "versions": [
                "1.0.4"
            ]
        },
        {
            "id": "IN-MAL-2026-009563",
            "import_time": "2026-07-09T22:56:34.690909543Z",
            "modified_time": "2026-07-09T22:14:01Z",
            "sha256": "884f2797ddf6247c906bb97e72b3c0891551b260980811d50c7211ab2ea0bbcf",
            "source": "amazon-inspector",
            "versions": [
                "1.0.3"
            ]
        }
    ]
}

References

Credits

- Amazon Inspector - FINDER
- - inspector-research@amazon.com
- OpenSSF: Package Analysis - FINDER
- - https://github.com/ossf/package-analysis
  - https://openssf.slack.com/channels/package_analysis

Affected packages

npm / npm-show-date-proof-strings

Package

Name: npm-show-date-proof-strings; View open source insights on deps.dev
Purl: pkg:npm/npm-show-date-proof-strings

Affected ranges

Affected versions

1.*

1.0.3

1.0.4

Database specific

cwes

[
    {
        "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.",
        "name": "Embedded Malicious Code"
    }
]

indicators

{
    "evidence_files": [
        {
            "path": "postinstall.js",
            "sha256": "62500f9dafe8ee32e328561a4b27003fec751450576f9ba0274912377aa76ee2",
            "tlsh": "74510e9854d77166eef16fa4c6160009fb6bc173620087f2f6fc49502f7756402a1eec"
        },
        {
            "path": "package.json",
            "sha256": "6dc318498edb8c8d112ef6cd5e7dc218ffee2ccb5f1a834a55e0435aa413566f",
            "tlsh": "9ee0cd948c205a633cc85a784d63840679344e2705247d186bd760488b5a77b44fe65d"
        }
    ],
    "package_integrity": [
        {
            "filename": "npm-show-date-proof-strings-1.0.4.tgz",
            "hashes": {
                "sha1": "bce1c5194188fbaf1646864fb1b0bc633b7d01f5",
                "sha512_sri": "sha512-0DG1lVsxWWVnhxnl1XxHwXgmm15oHWfdrfEdcjwS4G71DYoigihU+n9Gq1nfMdgsiGY1Qj/ZqvyCELm7cuvOJg=="
            }
        }
    ]
}

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/npm-show-date-proof-strings/MAL-2026-6791.json"