---
id: "MAL-2026-18300"
kind: "package"
aliases: ["MAL-2026-18300"]
title: "Malicious code in claudeopusenifile (PyPI)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "claudeopusenifile", "fixed": [], "affected": "= 0.1.3", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-25T23:40:43+00:00"
first_seen_at: "2026-10-26T20:52:03+00:00"
updated_at: "2026-10-26T21:05:48+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-18300", "first_seen_at": "2026-10-26T20:52:03+00:00"}]
---

# Malicious code in claudeopusenifile (PyPI)

## Affected

- pypi:claudeopusenifile affected = 0.1.3 fixed ?

## Timeline

- 2026-10-26T20:52:03+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-18300

## From the sources

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

## Source: kam193 (051daf7dfb8c28210996afbf561646b38781f563483e6c2e7471add0a6021885)
During installation, obfuscated code is used to fetch code hidden in an image containing a Python application with a native extension module. This module holds an obfuscated infostealer which collects sensitive data and exfiltrates them to a C2 server retrieved from transaction history in the Polygon blockchain.


---

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


Campaign: 2026-09-donutautosellsrc


Reasons (based on the campaign):


 - infostealer


 - Downloads and executes a remote executable.


 - obfuscation


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


 - malware


 - native-extension


 - steganography


 - c2-in-blockchain

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_