---
id: MAL-2026-17757
title: Malicious code in webreader (PyPI)
summary: Malicious code in webreader (PyPI)
severity: critical
exploited: true
vendor: webreader
product: webreader
ecosystem: pip
affected:
  - webreader
published: '2026-10-10'
updated: '2026-10-10'
sourceUpdated: '2026-10-10T11:45:03.466969731Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/MAL-2026-17757'
references:
  - url: 'https://bad-packages.kam193.eu/pypi/package/webreader'
tags:
  - osv
  - pip
  - malware
ingestedAt: '2026-10-11T07:43:08.915Z'
---

## Overview


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

## Source: kam193 (165632b7385ab993b6a8aa74c76ff55cc1ef55748c67b5dfabca284bc8ced087)
In this campaign, the main package (webreader) has an embeded pickle disguised as a config. A related dependency (pafer) contains code to load the pickle. During unpickling, malicious code embeded in the pickle file is automatically executed. It then establishes persistence via a PTH file and downloads the next stage payload. It finally acts like a RAT, allowing remote exfiltration and code execution.


---

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


Campaign: 2026-10-webreader


Reasons (based on the campaign):


 - rat


 - Downloads and executes a remote malicious script.


 - obfuscation


 - The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.


 - abuses-pth


 - persistence


 - The malicious code is intentionally included in a dependency of the package


 - files-exfiltration


## Affected packages

- `webreader`

## Remediation

Refer to the advisory for the patched release.