MAL-2026-6734
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (f2ae9afcd7af22c82b137c1142ae643502d82f3d1f28712b2e5c7ec412bea85e)
horde-python-client 99999.0.0 is a dependency-confusion lure. On import horde_python_client, a daemon thread unconditionally POSTs a JSON payload containing the host's hostname, the USER/USERNAME environment variable, and the current working directory to http://109.123.247.172/pypi over plain HTTP. The destination is a bare IP unrelated to any legitimate package publisher. The package ships with placeholder metadata (description "Internal package", author "Security Research") and an absurdly high version number (99999.0.0) — the canonical shape for overriding a target organization's private package of the same name in resolver precedence. Installer harm: any developer or build system that resolves this package and imports it leaks host identifiers to the attacker, confirming a successful dependency-confusion hit and enabling follow-on targeting.
Source: kam193 (ad72fe1fdc56e7fb5716a906fb8481bfe1e477d2f97c649d5db853a79130628a)
Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.
Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.
Campaign: GENERIC-standard-pypi-install-pentest
Reasons (based on the campaign):
-
The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
-
The package overrides the install command in setup.py to execute malicious code during installation.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"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": "horde_python_client/__init__.py",
"sha256": "2f180a296cc8490ee65619e18d1c62e85895ad4151ea927389c0e18f9364decf",
"tlsh": "6e01acc6e8345882628b724888254a782237b4576f02b8b0bd4c9f7c0fdc46952786f8"
},
{
"path": "setup.py",
"sha256": "cadb4d65a9b7ec5edadb1a7352b50f09b3ef3a32115b72f8bc7252d69a72a3a6",
"tlsh": "65d097524e4292b058c0c99e48e138021a28aa373e20b0e8f38003803f8e4db8f332a9"
}
],
"package_integrity": [
{
"filename": "horde_python_client-99999.0.0.tar.gz",
"hashes": {
"blake2b_256": "589c2b73bf17cc40ca0d837bbc6c8feeace5f61931e479bd673812cfd6732c01",
"md5": "a6f2c3b63758f3301b161bc75e71e02c",
"sha256": "c64fc3df904e530585083fd1d0ae3fef410b515b0335d10c1885cd0e75576990"
}
}
]
}
},
"package": {
"ecosystem": "PyPI",
"name": "horde-python-client"
},
"versions": [
"99999.0.0"
]
}
],
"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/GENERIC-standard-pypi-install-pentest/horde-python-client",
"import_time": "2026-07-02T21:29:02.667033146Z",
"modified_time": "2026-07-02T21:23:53.578472Z",
"sha256": "ad72fe1fdc56e7fb5716a906fb8481bfe1e477d2f97c649d5db853a79130628a",
"source": "kam193",
"versions": [
"99999.0.0"
]
},
{
"id": "IN-MAL-2026-008127",
"import_time": "2026-07-08T17:01:32.704709685Z",
"modified_time": "2026-07-08T16:28:39Z",
"sha256": "f2ae9afcd7af22c82b137c1142ae643502d82f3d1f28712b2e5c7ec412bea85e",
"source": "amazon-inspector",
"versions": [
"99999.0.0"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (f2ae9afcd7af22c82b137c1142ae643502d82f3d1f28712b2e5c7ec412bea85e)\nhorde-python-client 99999.0.0 is a dependency-confusion lure. On `import horde_python_client`, a daemon thread unconditionally POSTs a JSON payload containing the host\u0027s hostname, the USER/USERNAME environment variable, and the current working directory to http://109.123.247.172/pypi over plain HTTP. The destination is a bare IP unrelated to any legitimate package publisher. The package ships with placeholder metadata (description \"Internal package\", author \"Security Research\") and an absurdly high version number (99999.0.0) \u2014 the canonical shape for overriding a target organization\u0027s private package of the same name in resolver precedence. Installer harm: any developer or build system that resolves this package and imports it leaks host identifiers to the attacker, confirming a successful dependency-confusion hit and enabling follow-on targeting.\n\n## Source: kam193 (ad72fe1fdc56e7fb5716a906fb8481bfe1e477d2f97c649d5db853a79130628a)\nInstalling the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.\n\n\n---\n\nCategory: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research \u0026 co, with clearly low-harm possibilities.\n\n\nCampaign: GENERIC-standard-pypi-install-pentest\n\n\nReasons (based on the campaign):\n\n\n - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n",
"id": "MAL-2026-6734",
"modified": "2026-07-08T17:03:30Z",
"published": "2026-07-02T21:23:53Z",
"references": [
{
"type": "WEB",
"url": "https://bad-packages.kam193.eu/pypi/package/horde-python-client"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/horde-python-client/99999.0.0/"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in horde-python-client (PyPI)"
}
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 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.