MAL-2026-12477

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tcb-web-images/MAL-2026-12477.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12477
Aliases
  • GHSA-66p5-8752-xpg8
Published
2026-08-05T12:37:48Z
Modified
2026-08-06T01:21:26.252625160Z
Summary
Malicious code in tcb-web-images (npm)
Details

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

Source: amazon-inspector (1e4ea2872f88d974e66cc870c5fbfbf92294eb63026155a96bea567a096f4d69)

On require('tcb-web-images'), index.js loads _helpers.js which immediately runs a setup routine that selects an OS/arch-specific URL path and downloads a binary over HTTPS from one of four Cloudflare Workers hosts whose names are assembled at runtime by joining string-array fragments (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT chunked fallback under *.dl.well1.site. The downloaded bytes are written to /var/tmp or %TEMP% under disguised names mimicking system utilities (.cache_<rand> on Unix, dotnet_diag_<rand>.exe on Windows), chmod'd 0755, and detach-spawned via /bin/sh -c '<path> &' or cmd.exe. A freshness marker is stored as .analytics_state and stderr is silenced by a no-op logger. A second, larger copy of the same dropper is shipped as lib/telemetry.js under an 'analytics SDK' cover story, using additional string-concatenation obfuscation (require("child_" + "process"), fs["chmod"+"Sync"]); it is not referenced by the current index.js but is bundled at the tarball root. The package is advertised as a 'lightweight images wrapper' — the dropper behavior is unrelated to that purpose, the destinations are author-controlled and obfuscated to defeat scanners, and the delivered bytes are an opaque native executable with no publisher provenance, integrity check, or version pinning.

Source: ghsa-malware (c1380a3b63e9f71c1a3d2d58040216fe5ffc0a0b27291d8d4596224f1ee6aa64)

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": [
                "20.5.3"
            ],
            "id": "IN-MAL-2026-014735",
            "import_time": "2026-08-05T13:08:42.036893997Z",
            "modified_time": "2026-08-05T12:37:48Z",
            "source": "amazon-inspector",
            "sha256": "1e4ea2872f88d974e66cc870c5fbfbf92294eb63026155a96bea567a096f4d69"
        },
        {
            "modified_time": "2026-08-05T15:00:48Z",
            "id": "GHSA-66p5-8752-xpg8",
            "import_time": "2026-08-06T00:58:53.298356951Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "source": "ghsa-malware",
            "sha256": "c1380a3b63e9f71c1a3d2d58040216fe5ffc0a0b27291d8d4596224f1ee6aa64"
        }
    ]
}
References
Credits

Affected packages

npm / tcb-web-images

Package

Name
tcb-web-images
View open source insights on deps.dev
Purl
pkg:npm/tcb-web-images

Affected ranges

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

Affected versions

20.*
20.5.3

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "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."
    }
]
indicators 
{
    "package_integrity": [
        {
            "filename": "tcb-web-images-20.5.3.tgz",
            "hashes": {
                "sha512_sri": "sha512-RfVYlX3JgnkwyCV4hDpDEt+e58hwJmL7NU5iDy8hk71L/vo1KEWl8OO/muz9EfLWqW3sBiQrZNIYcpcqaQX3/A==",
                "sha1": "e70f9661abb24b181afbaf7c42eecb6f2a3f2a11"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "_helpers.js",
            "tlsh": "61a1d89a06a5701987b097e4cb275415fa6bf6633380c2d0f76ca5985fb71248372efc",
            "sha256": "cf837d3155d3d59f846ee03347260f0851d53b5bbe869c6c2f1b04fecb5d88d6"
        },
        {
            "path": "lib/telemetry.js",
            "tlsh": "04835f55566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "f1ff15bc5fdb211551d6b71be6d1497c0df41cad994afafbbf10a4248ab6b56f"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tcb-web-images/MAL-2026-12477.json"