MAL-2026-6342

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/therdweb/MAL-2026-6342.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6342
Aliases
  • GHSA-g2vx-7x66-f2wv
Published
2026-06-23T20:01:30Z
Modified
2026-07-27T10:08:44Z
Summary
Malicious code in therdweb (npm)
Details

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

Source: amazon-inspector (d9e63765322daedaf6d802d322402a1837d3ec653ecf47909d243e5c87398117)

The package's name 'therdweb' is a one-character variation of the popular 'thirdweb' SDK, while its contents (README, source code, author field 'Michael Mclaughlin', repository URL pointing at MikeMcl/big.js, version banner '7.0.1') are copied verbatim from the unrelated big.js library — the publisher is not the original author of either project. Both shipped entrypoints, big.js and big.mjs, contain an injected try/catch block that performs require("parket-slot") and immediately invokes doc.from_str() on it at module load, with the catch block left empty to swallow errors. parket-slot is not listed in package.json dependencies and is not mentioned in the README (which falsely claims 'No dependencies'); package.json additionally declares an undocumented dependency log-taker@^0.0.9. Any consumer that imports or requires this package will execute code from these external, undeclared/hidden modules controlled by the same actor, while the README hides their existence. This is the loader half of a multi-package install-graph dropper paired with name-confusion against thirdweb and identity impersonation of big.js.

Source: ghsa-malware (3a71ff401b8ca3f61c6dcb8b5ea46adbda1fc6eb03e773757cadae905c02dce8)

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": [
        {
            "id": "IN-MAL-2026-007357",
            "import_time": "2026-06-23T20:48:30.793539676Z",
            "modified_time": "2026-06-23T20:01:30Z",
            "sha256": "d9e63765322daedaf6d802d322402a1837d3ec653ecf47909d243e5c87398117",
            "source": "amazon-inspector",
            "versions": [
                "0.0.8"
            ]
        },
        {
            "id": "GHSA-g2vx-7x66-f2wv",
            "import_time": "2026-07-27T09:43:03.800072366Z",
            "modified_time": "2026-07-27T01:18:03Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "3a71ff401b8ca3f61c6dcb8b5ea46adbda1fc6eb03e773757cadae905c02dce8",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / therdweb

Package

Name
therdweb
View open source insights on deps.dev
Purl
pkg:npm/therdweb

Affected ranges

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

Affected versions

0.*
0.0.8

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": "big.js",
            "sha256": "5b803b2bbd43db704b5802fa5bf4da96e79c3b876d74495116b53a837101dace",
            "tlsh": "24c2658c3ac67579593363788f4a5088eb38525712c8b186b4ae63b46f78cb107b5fdc"
        },
        {
            "path": "package.json",
            "sha256": "a5ed77bf96808cd9df14566d6e83f54fcaddb4dcd576fa898e147aced0dbcb26",
            "tlsh": "76210467c9a59da70af85ba47c6c03aaf1151b1f44a05c5bb07b130c4b3355b2096b7d"
        }
    ],
    "package_integrity": [
        {
            "filename": "therdweb-0.0.8.tgz",
            "hashes": {
                "sha1": "188b33c5d430cbdf1ca4ad3ca5700d26ba6804b1",
                "sha512_sri": "sha512-EQz6H89XVA6bE2l1B6kAzTsD0r5sgKtIHeLUXgfrdT70BHWfwlOO6iqpa/Gc5z1pENV8tGlmEeBpx3ci7gU2tA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/therdweb/MAL-2026-6342.json"