MAL-2026-5290
Vulnerability from ossf_malicious_packages
Published
2026-06-06 06:13
Modified
2026-06-12 19:46
Summary
Malicious code in cmd2func (PyPI)
Details

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

Source: amazon-inspector (055d480cc069717b82f618e12d453e7d8dc7d2e83bf77ae25ae23f71e73a1d1a)

The package installs cmd2func-setup.pth, a.pth file that Python auto-loads at every interpreter start. The single-line payload uses the.pth import-trick with or exec(...) and mangled single-letter identifiers to smuggle a multi-statement body past review. When executed, the payload checks for a sentinel at /tmp/.bun_ran and, if absent, downloads the Bun runtime zip from https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{platform}-{arch}.zip into /tmp/b/, extracts the bun binary, chmods it executable (0o775), and runs bun run _index.js against a JS file resolved via glob inside the package. The advertised purpose of cmd2func is Convert command to callable Python object — there is no legitimate need for an alternate JavaScript runtime. The combination of a hidden.pth auto-loader, obfuscated payload, alternate-runtime dropper, and unrelated JS execution is a covert dropper that fires on every Python interpreter invocation after install, not just at install time. The RECORD/metadata references the prior 0.2.1 version, consistent with a hijack of a previously legitimate package.

Source: kam193 (c56f23d1c59dd91728afaa8ae022f711a719574aeeabc0e2eee8f5d93dd30d21)

Versions 0.2.2, 0.2.3 were compromised.

Compromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional secrets as well as attempts to gain persistence and spread further by publishing infected packages using collected credentials. Data are exfiltrated likely using Github. The code seems to threaten to wipe the user's data if it detects invalid GitHub tokens. Cleanup should be done with caution.

It seems to be related to the recent Mini Shai Hulud campaign.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-06-compr-woodpecker

Reasons (based on the campaign):

  • compromised-package

  • exfiltration-env-variables

  • exfiltration-cloud-tokens

  • exfiltration-credentials

  • abuses-pth

  • obfuscation

  • infostealer

  • The package contains code to detect if it is running in a sandbox environment.

  • exfiltration-crypto

  • files-exfiltration

  • destructive-actions

CWE
  • CWE-506 - The product contains code that appears to be malicious in nature.
Credits
Amazon Inspector inspector-research@amazon.com
Kamil Mańkowski (kam193) github.com/kam193 bad-packages.kam193.eu/
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"
          }
        ],
        "indicators": {
          "evidence_files": [
            {
              "path": "cmd2func-setup.pth",
              "sha256": "c539766062555d47716f8432e73adbe3a0c0c954a0b6c4005017a668975e275c",
              "tlsh": "4911c02e429385b0d975d646830b19f4afdb8ce28fc79506c8d8d4c1a7b2e50e3b7684"
            }
          ],
          "package_integrity": [
            {
              "filename": "cmd2func-0.2.2-py3-none-any.whl",
              "hashes": {
                "blake2b_256": "09c49296b151f3afa5c724e40e3f1da320c9ec8a06a3a796b488614f8149271a",
                "md5": "44d972cf232ead51d4d78d20cbbddadb",
                "sha256": "6a7c59cc45ccc8d1292d1c5bec35ecd4d3329072e20e562e59c7ae39645384b0"
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "cmd2func"
      },
      "versions": [
        "0.2.2",
        "0.2.3"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    },
    {
      "contact": [
        "https://github.com/kam193",
        "https://bad-packages.kam193.eu/"
      ],
      "name": "Kamil Ma\u0144kowski (kam193)",
      "type": "REPORTER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "pypi/2026-06-compr-woodpecker/cmd2func",
        "import_time": "2026-06-07T07:31:09.63940736Z",
        "modified_time": "2026-06-06T06:13:57Z",
        "sha256": "c56f23d1c59dd91728afaa8ae022f711a719574aeeabc0e2eee8f5d93dd30d21",
        "source": "kam193",
        "versions": [
          "0.2.2",
          "0.2.3"
        ]
      },
      {
        "id": "pypi/2026-06-compr-woodpecker/cmd2func",
        "import_time": "2026-06-08T11:41:02.516044434Z",
        "modified_time": "2026-06-06T06:13:57Z",
        "sha256": "9308ab37378e86a6adad9ca85fa7888e9a9f370eea133415adc68ea3810621ea",
        "source": "kam193",
        "versions": [
          "0.2.2",
          "0.2.3"
        ]
      },
      {
        "id": "pypi/2026-06-compr-woodpecker/cmd2func",
        "import_time": "2026-06-08T19:19:19.172299855Z",
        "modified_time": "2026-06-07T06:32:15Z",
        "sha256": "3770293dd6cce24bf97433a78e083aee8710157617361ee9428d6b48ef87bf21",
        "source": "kam193",
        "versions": [
          "0.2.2",
          "0.2.3"
        ]
      },
      {
        "id": "pypi/2026-06-compr-woodpecker/cmd2func",
        "import_time": "2026-06-09T07:48:29.633143653Z",
        "modified_time": "2026-06-07T06:32:15Z",
        "sha256": "01a15f51e5e63c1de7516f5734211a4a077721fa79f1d8c2137873bc1fd98d23",
        "source": "kam193",
        "versions": [
          "0.2.2",
          "0.2.3"
        ]
      },
      {
        "id": "IN-MAL-2026-006200",
        "import_time": "2026-06-12T19:44:19.251486918Z",
        "modified_time": "2026-06-12T19:11:06Z",
        "sha256": "055d480cc069717b82f618e12d453e7d8dc7d2e83bf77ae25ae23f71e73a1d1a",
        "source": "amazon-inspector",
        "versions": [
          "0.2.2"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (055d480cc069717b82f618e12d453e7d8dc7d2e83bf77ae25ae23f71e73a1d1a)\nThe package installs cmd2func-setup.pth, a.pth file that Python auto-loads at every interpreter start. The single-line payload uses the.pth import-trick with `or exec(...)` and mangled single-letter identifiers to smuggle a multi-statement body past review. When executed, the payload checks for a sentinel at /tmp/.bun_ran and, if absent, downloads the Bun runtime zip from https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{platform}-{arch}.zip into /tmp/b/, extracts the `bun` binary, chmods it executable (0o775), and runs `bun run _index.js` against a JS file resolved via glob inside the package. The advertised purpose of cmd2func is `Convert command to callable Python object` \u2014 there is no legitimate need for an alternate JavaScript runtime. The combination of a hidden.pth auto-loader, obfuscated payload, alternate-runtime dropper, and unrelated JS execution is a covert dropper that fires on every Python interpreter invocation after install, not just at install time. The RECORD/metadata references the prior 0.2.1 version, consistent with a hijack of a previously legitimate package.\n\n## Source: kam193 (c56f23d1c59dd91728afaa8ae022f711a719574aeeabc0e2eee8f5d93dd30d21)\nVersions 0.2.2, 0.2.3 were compromised.\n\n\nCompromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional secrets as well as attempts to gain persistence and spread further by publishing infected packages using collected credentials. Data are exfiltrated likely using Github. The code seems to threaten to wipe the user\u0027s data if it detects invalid GitHub tokens. Cleanup should be done with caution.\n\nIt seems to be related to the recent Mini Shai Hulud campaign.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-06-compr-woodpecker\n\n\nReasons (based on the campaign):\n\n\n - compromised-package\n\n\n - exfiltration-env-variables\n\n\n - exfiltration-cloud-tokens\n\n\n - exfiltration-credentials\n\n\n - abuses-pth\n\n\n - obfuscation\n\n\n - infostealer\n\n\n - The package contains code to detect if it is running in a sandbox environment.\n\n\n - exfiltration-crypto\n\n\n - files-exfiltration\n\n\n - destructive-actions\n",
  "id": "MAL-2026-5290",
  "modified": "2026-06-12T19:46:18Z",
  "published": "2026-06-06T06:13:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://socket.dev/blog/mini-shai-hulud-campaign-hits-red-hat-cloud-services-npm-packages"
    },
    {
      "type": "WEB",
      "url": "https://bad-packages.kam193.eu/pypi/campaign/2026-06-compr-woodpecker"
    },
    {
      "type": "WEB",
      "url": "https://socket.dev/blog/shai-hulud-descends-to-hades-miasma-pypi-wave"
    },
    {
      "type": "WEB",
      "url": "https://o3.security/blog/pypi-supply-chain-attack-pth-file-miasma"
    },
    {
      "type": "WEB",
      "url": "https://socket.dev/blog/mini-shai-hulud-miasma-and-hades-worms-target-bioinformatics-and-mcp-developers-via-malicious"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/cmd2func/0.2.2/"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in cmd2func (PyPI)"
}


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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.


Detection rules are retrieved from Rulezet.