MAL-2026-5281
Vulnerability from ossf_malicious_packages
Published
2026-06-06 06:13
Modified
2026-06-12 19:46
Summary
Malicious code in executor-http (PyPI)
Details

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

Source: amazon-inspector (cde4da7201fbc0dd3ae09240232f5767c2893e33977d6c8ee9071d15e79f0363)

The package ships executor_http-setup.pth, which Python auto-loads at interpreter start for any environment where the package is installed. The.pth file calls exec() on an obfuscated single-line string (mangled one-letter underscore identifiers like _O, _T, _G, _u, _s, _b, _z) that downloads https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{platform}-{arch}.zip to /tmp/b/bun, chmods it executable, then runs subprocess.run([bun, 'run', _index.js]) to execute a sibling JavaScript file under the Bun runtime. A /tmp/.bun_ran sentinel suppresses re-execution. The advertised purpose of executor-http is a FastAPI/uvicorn HTTP server for executor-engine — there is no legitimate reason for it to fetch a JavaScript runtime and execute JS code outside of Python's view. The legitimate FastAPI source under executor/http/ appears unmodified, and the distribution metadata is inconsistent (__init__.py reports 0.1.2, METADATA says 0.1.3, RECORD references executor_http-0.1.2.dist-info), consistent with a hijacked publish-credential adding a dropper to an otherwise normal upstream release. The.pth-based auto-execution mechanism is itself an evasion technique that bypasses review of __init__.py and lifecycle hooks, and the alternate-runtime stage (Bun executing _index.js) places the actual payload outside any Python static analysis surface.

Source: kam193 (4396c593615517f1abf374bf3621ad44a9d0b5c540aaf8c8e101cd4954f7d7be)

Versions 0.1.3, 0.1.4 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": "executor_http-setup.pth",
              "sha256": "c539766062555d47716f8432e73adbe3a0c0c954a0b6c4005017a668975e275c",
              "tlsh": "4911c02e429385b0d975d646830b19f4afdb8ce28fc79506c8d8d4c1a7b2e50e3b7684"
            }
          ],
          "package_integrity": [
            {
              "filename": "executor_http-0.1.3-py3-none-any.whl",
              "hashes": {
                "blake2b_256": "4009cca1f4298a805a33a9a6d3c5fe874606975eb8013041ee759a0d3717c280",
                "md5": "cac2e4b4b3d5fbeaaa5a25db3442537e",
                "sha256": "9f91985b902135d63c1806017690509ab2704ef5f79871b23ddd949076b0e968"
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "executor-http"
      },
      "versions": [
        "0.1.3",
        "0.1.4"
      ]
    }
  ],
  "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/executor-http",
        "import_time": "2026-06-06T07:59:00.773235764Z",
        "modified_time": "2026-06-06T06:13:57Z",
        "sha256": "4396c593615517f1abf374bf3621ad44a9d0b5c540aaf8c8e101cd4954f7d7be",
        "source": "kam193",
        "versions": [
          "0.1.3",
          "0.1.4"
        ]
      },
      {
        "id": "pypi/2026-06-compr-woodpecker/executor-http",
        "import_time": "2026-06-08T11:41:02.523970189Z",
        "modified_time": "2026-06-06T06:13:57Z",
        "sha256": "2f8706fa6e3490fd1604a5b98627ead50d01a949c03d7b1e69e3c45e63039f1c",
        "source": "kam193",
        "versions": [
          "0.1.3",
          "0.1.4"
        ]
      },
      {
        "id": "pypi/2026-06-compr-woodpecker/executor-http",
        "import_time": "2026-06-08T19:19:19.178882526Z",
        "modified_time": "2026-06-06T06:35:55Z",
        "sha256": "fe7612103d2f4e8241cf1309b18f861afcd61541fbf822907f4d79cbbf5ca436",
        "source": "kam193",
        "versions": [
          "0.1.3",
          "0.1.4"
        ]
      },
      {
        "id": "pypi/2026-06-compr-woodpecker/executor-http",
        "import_time": "2026-06-09T07:48:29.638817608Z",
        "modified_time": "2026-06-06T06:35:55Z",
        "sha256": "f9c1d1f9ab790bc8106fcfd74c547bcc4068a1b3f482dee948103e9db825c523",
        "source": "kam193",
        "versions": [
          "0.1.3",
          "0.1.4"
        ]
      },
      {
        "id": "IN-MAL-2026-006133",
        "import_time": "2026-06-12T19:44:11.812422407Z",
        "modified_time": "2026-06-12T19:09:43Z",
        "sha256": "cde4da7201fbc0dd3ae09240232f5767c2893e33977d6c8ee9071d15e79f0363",
        "source": "amazon-inspector",
        "versions": [
          "0.1.3"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (cde4da7201fbc0dd3ae09240232f5767c2893e33977d6c8ee9071d15e79f0363)\nThe package ships `executor_http-setup.pth`, which Python auto-loads at interpreter start for any environment where the package is installed. The.pth file calls `exec()` on an obfuscated single-line string (mangled one-letter underscore identifiers like `_O`, `_T`, `_G`, `_u`, `_s`, `_b`, `_z`) that downloads `https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/bun-{platform}-{arch}.zip` to `/tmp/b/bun`, chmods it executable, then runs `subprocess.run([bun, \u0027run\u0027, _index.js])` to execute a sibling JavaScript file under the Bun runtime. A `/tmp/.bun_ran` sentinel suppresses re-execution. The advertised purpose of executor-http is a FastAPI/uvicorn HTTP server for executor-engine \u2014 there is no legitimate reason for it to fetch a JavaScript runtime and execute JS code outside of Python\u0027s view. The legitimate FastAPI source under `executor/http/` appears unmodified, and the distribution metadata is inconsistent (`__init__.py` reports 0.1.2, METADATA says 0.1.3, RECORD references `executor_http-0.1.2.dist-info`), consistent with a hijacked publish-credential adding a dropper to an otherwise normal upstream release. The.pth-based auto-execution mechanism is itself an evasion technique that bypasses review of `__init__.py` and lifecycle hooks, and the alternate-runtime stage (Bun executing `_index.js`) places the actual payload outside any Python static analysis surface.\n\n## Source: kam193 (4396c593615517f1abf374bf3621ad44a9d0b5c540aaf8c8e101cd4954f7d7be)\nVersions 0.1.3, 0.1.4 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-2026-5281",
  "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/executor-http/0.1.3/"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in executor-http (PyPI)"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.