MAL-2026-6278

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ts-wross/MAL-2026-6278.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6278
Aliases
  • GHSA-53h7-mc3v-w73c
Published
2026-06-23T06:22:06Z
Modified
2026-06-23T17:01:26.470404349Z
Summary
Malicious code in ts-wross (npm)
Details

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

Source: amazon-inspector (42dae43b7ff77748f10ae5faf6d87b7d63552e5629a37c931ea2c0de3539b469)

Package is published under the name ts-wross but its package.json claims authorship by Michael Mclaughlin (M8ch88l@gmail.com) and points its repository field at https://github.com/MikeMcl/big.js.git, with description and keywords copied from the legitimate big.js arbitrary-precision arithmetic library. The shipped source is a verbatim copy of big.js v7.0.1 with one modification: a try/catch block injected mid-file in both big.js and big.mjs that runs const doc = require("node-slot"); doc.from_str().then(...).catch(...) at module load. Errors are swallowed by the surrounding try/catch so the call is silent. node-slot is declared as a runtime dependency ("node-slot": "^1.0.8") and is therefore pulled in and executed on any require('ts-wross') / import 'ts-wross'. The legitimate big.js has zero dependencies and no such call — the inserted require is a loader trampoline that hands import-time execution on the installer's machine to whatever code node-slot ships. Combined with the impersonated metadata, the package is a lure that drops attacker-controlled code into any consumer that installs it under the assumption it is or relates to big.js.

Source: ghsa-malware (f2ee248f4b7fad7f6a978fbc5f1accf635566ce61a3ee32f1353eba91bbe42d6)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "f2ee248f4b7fad7f6a978fbc5f1accf635566ce61a3ee32f1353eba91bbe42d6",
            "import_time": "2026-06-23T07:33:18.913494656Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "modified_time": "2026-06-23T06:22:06Z",
            "id": "GHSA-53h7-mc3v-w73c",
            "source": "ghsa-malware"
        },
        {
            "sha256": "42dae43b7ff77748f10ae5faf6d87b7d63552e5629a37c931ea2c0de3539b469",
            "id": "IN-MAL-2026-007271",
            "source": "amazon-inspector",
            "modified_time": "2026-06-23T16:11:26Z",
            "versions": [
                "0.0.8"
            ],
            "import_time": "2026-06-23T16:54:13.52835658Z"
        }
    ]
}
References
Credits

Affected packages

npm / ts-wross

Package

Name
ts-wross
View open source insights on deps.dev
Purl
pkg:npm/ts-wross

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.0.8

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ts-wross/MAL-2026-6278.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "sha256": "442c54a9b0beff03159cb7dd3a59ad1c09dbe09f0bcec91df0a33a032a2e4f99",
            "tlsh": "c6c2658c3ac67579593363788f465088eb38525712c8b286b4ae63b46f78cb107b5fdc",
            "path": "big.js"
        },
        {
            "tlsh": "c0212677c9a19da70af89b947c6c03aaf1151b1f40a04c5bb07b130c4f3345b2095b7d",
            "sha256": "140bde4932b0284dafc5ca7d592ad54c2e07bdc6e3c9bd290c9f2de93718a6ec",
            "path": "package.json"
        }
    ]
}