Vulnerability-Lookup

mal-2026-15556

Vulnerability from ossf_malicious_packages

Published

2026-08-29 02:14

Modified

2026-08-29 02:24

Summary

Malicious code in js-tokens-array (npm)

Details

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

Source: amazon-inspector (3f8ed5536e88f2c77c432b868367e25dea9244052779e825999e6e4324dcc35b)

index.js runs getToken() at module load time. The destination URL is reconstructed from a numeric char-code array via String.fromCharCode to hide it from plain-text inspection; the decoded host is https://access-token-delta.vercel.app/. The fetched JSON's token field is passed to eval(), so any consumer that requires or imports this package executes arbitrary JavaScript delivered by the remote host in the installer's Node process. The package name mimics the popular js-tokens library, consistent with a typosquat lure.

CWE

CWE-506 - The product contains code that appears to be malicious in nature.
CWE-506 - The product contains code that appears to be malicious in nature.

Credits

Amazon Inspector inspector-research@amazon.com

JSON

To clipboard

{
  "affected": [
    {
      "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": "index.js",
              "sha256": "e5c2f28ccd42f588a2cf725917589be397b5ed7a6319ce5bdca0ab026d4b65f7",
              "tlsh": "e2f0279118bc4975023fe46a0a0f1816a508e313192de8c3b3cc4f442f198697d766c8"
            }
          ],
          "package_integrity": [
            {
              "filename": "js-tokens-array-1.0.0.tgz",
              "hashes": {
                "sha1": "0830e93e52aeec626f357240218bd6bf0e877bf7",
                "sha512_sri": "sha512-gWUxZd0+uaCarRmXWKCwn0gBNB0RCyDUQriN3basdxyUIjsTSMSKXnJVH4AuajjrzctzlaYzVgL7SAENci6IQQ=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "js-tokens-array"
      },
      "versions": [
        "1.0.0",
        "1.1.1"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-019143",
        "import_time": "2026-08-29T02:22:21.291695155Z",
        "modified_time": "2026-08-29T02:14:24Z",
        "sha256": "35bd7f6a22d21fe244f3564f2b9fdd874a7824637fc6cc2d9726b2eeb9b88e4f",
        "source": "amazon-inspector",
        "versions": [
          "1.0.0"
        ]
      },
      {
        "id": "IN-MAL-2026-019141",
        "import_time": "2026-08-29T02:22:21.114202894Z",
        "modified_time": "2026-08-29T02:14:09Z",
        "sha256": "3f8ed5536e88f2c77c432b868367e25dea9244052779e825999e6e4324dcc35b",
        "source": "amazon-inspector",
        "versions": [
          "1.1.1"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (3f8ed5536e88f2c77c432b868367e25dea9244052779e825999e6e4324dcc35b)\nindex.js runs getToken() at module load time. The destination URL is reconstructed from a numeric char-code array via String.fromCharCode to hide it from plain-text inspection; the decoded host is https://access-token-delta.vercel.app/. The fetched JSON\u0027s `token` field is passed to eval(), so any consumer that requires or imports this package executes arbitrary JavaScript delivered by the remote host in the installer\u0027s Node process. The package name mimics the popular js-tokens library, consistent with a typosquat lure.\n",
  "id": "MAL-2026-15556",
  "modified": "2026-08-29T02:24:17Z",
  "published": "2026-08-29T02:14:09Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/js-tokens-array/v/1.0.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/js-tokens-array/v/1.1.1"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in js-tokens-array (npm)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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