MAL-2026-5896
Vulnerability from ossf_malicious_packages
Published
2026-06-16 15:37
Modified
2026-06-16 16:08
Summary
Malicious code in jest-test-plugin-utils (npm)
Details

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

Source: amazon-inspector (3f948eff13632557a65152c587b6aa87783e49cf40504aedca8ee15da6ed205e)

The package advertises itself as a Jest plugin (name: 'jest-test-plugin-utils', description: 'mqtt utils') but ships no Jest or MQTT functionality. Its main entry dist/index.js is a heavily obfuscated 200KB browserify bundle (obfuscator.io fingerprint: 1299-entry rotated string array, decoder wrapper, control-flow flattening; built with the declared devDependency 'gulp-javascript-obfuscator'). After deobfuscation, the only meaningful behavior is a function loadFilbetScriptSilently() (exposed as window.fetchFilbetScript) that creates a element with src='https://cdn.jsdelivr.net/gh/gongben2024/network-security@main/src/filbet.js' and appends it to document.head, executing whatever code the author hosts at that mutable @main branch. The destination repository is named 'network-security' under author 'gongben2024' and is unrelated to the package's stated purpose. Because the reference is to the @main branch (not a pinned commit/tag), the author can change the executed payload at any time without republishing this package. Any application that bundles or imports this module will execute attacker-controlled JavaScript in the browser context, with full access to the host page's DOM, cookies, and storage. The combination of name camouflage, heavy obfuscation, and unpinned remote-script execution is a deliberate supply-chain attack pattern.

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.
  • 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

{
  "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"
          },
          {
            "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": "dist/index.js",
              "sha256": "a61584375c14c072e01ec862ed28d36ff0157245a5b195229da9dafa8946a040",
              "tlsh": "e514404077c0b844538b1fba766fb4e5e46b1de934c4090bc515fca0f5baa26fae2934"
            },
            {
              "path": "package.json",
              "sha256": "b152b66b1f3a7e2634d7dcdb3cf45409e2fa55d9770b061f6f6f5c92db06f513",
              "tlsh": "fdf02734dd71987306e820e51c682167e0709d2bc245fd1c33c7140c4a5f2eb64be6ac"
            }
          ],
          "package_integrity": [
            {
              "filename": "jest-test-plugin-utils-1.0.0.tgz",
              "hashes": {
                "sha1": "b8a42abd71c8e56f7560f015cdc53596b0f9b476",
                "sha512_sri": "sha512-ipOiWo9EBBPkhnInqSV4Se9fDI6iUR/13dKvtt04vFctEePsyzs2NuYD4JAkmm/jZw7gpc7hDbyCvCBjIWlK2Q=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "jest-test-plugin-utils"
      },
      "versions": [
        "1.0.0",
        "1.0.2",
        "1.0.1",
        "1.0.4"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-006765",
        "import_time": "2026-06-16T16:06:34.427097256Z",
        "modified_time": "2026-06-16T15:37:24Z",
        "sha256": "3f948eff13632557a65152c587b6aa87783e49cf40504aedca8ee15da6ed205e",
        "source": "amazon-inspector",
        "versions": [
          "1.0.0"
        ]
      },
      {
        "id": "IN-MAL-2026-006764",
        "import_time": "2026-06-16T16:06:34.332185997Z",
        "modified_time": "2026-06-16T15:37:23Z",
        "sha256": "54c5196f3361da72dfccd2c8abb0caba132415f9907602c5a6ec92d6da2e077f",
        "source": "amazon-inspector",
        "versions": [
          "1.0.2"
        ]
      },
      {
        "id": "IN-MAL-2026-006766",
        "import_time": "2026-06-16T16:06:34.568829617Z",
        "modified_time": "2026-06-16T15:37:30Z",
        "sha256": "bb80fa98045e0dd75514425f419aa986e7e57bfa888d8baaa8c5eb0016418f83",
        "source": "amazon-inspector",
        "versions": [
          "1.0.1"
        ]
      },
      {
        "id": "IN-MAL-2026-006763",
        "import_time": "2026-06-16T16:06:34.127682958Z",
        "modified_time": "2026-06-16T15:37:20Z",
        "sha256": "f5445eba984ab32829120583a68c6bfc2fa8aec2f875b506c873de598f1d27d1",
        "source": "amazon-inspector",
        "versions": [
          "1.0.4"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (3f948eff13632557a65152c587b6aa87783e49cf40504aedca8ee15da6ed205e)\nThe package advertises itself as a Jest plugin (name: \u0027jest-test-plugin-utils\u0027, description: \u0027mqtt utils\u0027) but ships no Jest or MQTT functionality. Its main entry dist/index.js is a heavily obfuscated 200KB browserify bundle (obfuscator.io fingerprint: 1299-entry rotated string array, decoder wrapper, control-flow flattening; built with the declared devDependency \u0027gulp-javascript-obfuscator\u0027). After deobfuscation, the only meaningful behavior is a function loadFilbetScriptSilently() (exposed as window.__fetchFilbetScript__) that creates a \u003cscript\u003e element with src=\u0027https://cdn.jsdelivr.net/gh/gongben2024/network-security@main/src/filbet.js\u0027 and appends it to document.head, executing whatever code the author hosts at that mutable @main branch. The destination repository is named \u0027network-security\u0027 under author \u0027gongben2024\u0027 and is unrelated to the package\u0027s stated purpose. Because the reference is to the @main branch (not a pinned commit/tag), the author can change the executed payload at any time without republishing this package. Any application that bundles or imports this module will execute attacker-controlled JavaScript in the browser context, with full access to the host page\u0027s DOM, cookies, and storage. The combination of name camouflage, heavy obfuscation, and unpinned remote-script execution is a deliberate supply-chain attack pattern.\n",
  "id": "MAL-2026-5896",
  "modified": "2026-06-16T16:08:48Z",
  "published": "2026-06-16T15:37:20Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/jest-test-plugin-utils/v/1.0.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/jest-test-plugin-utils/v/1.0.2"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/jest-test-plugin-utils/v/1.0.1"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/jest-test-plugin-utils/v/1.0.4"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in jest-test-plugin-utils (npm)"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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