Cyber·Monitoring
Shai-Hulud Supply-Chain Attack Trojanizes 19 PyPI Packages
PyPI repository (global online service)· Global4 Jun
5 reportsPROPCYCAS
MediumAI Refreshed
ClosedMedium impactAI Generated
JDownloader Website Hacked – Malicious Installers Distribute Python RAT Malware
Occurred 5 May 2026·Detected 10 May 2026·
Global – JDownloader official website (origin of compromise not specified); Windows and Linux users worldwide at risk1 reportEnded 10 May 2026
CyberPropertyCyberCasualty & Liability
The official website for JDownloader, a widely used open-source download manager, was compromised earlier in the week of 9 May 2026. Threat actors replaced legitimate Windows and Linux installers with malicious versions. The Windows payload was found to deploy a Python-based remote access trojan (RAT), potentially exposing a large number of end users globally to system compromise.
AI-generated from linked source reports. See our correction policy.
Impact verdict
Medium impact. JDownloader is a popular download manager with a large global user base, meaning potentially many thousands of end users could have downloaded and executed the malicious installer. However, the impact is largely confined to individual end-user devices and small businesses rather than critical infrastructure, limiting the aggregate insured loss exposure.
View assessment methodologyHow we grade what we know -- Known · Reported · Uncertain. Methodology →
Intelligence ledger
Each line expands in place to its underlying sourced claim.
Known5 lines
JDownloader's official website was hacked and its installers were replaced with malicious versions.▾
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Both Windows and Linux installers were affected.▾
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The Windows payload deploys a Python-based remote access trojan (RAT).▾
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The incident occurred earlier in the week of 9 May 2026.▾
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BleepingComputer reported the incident on 9 May 2026.▾
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Reported2 lines
The Linux installer may also contain malicious payloads, though the Windows RAT is specifically confirmed.▾
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The compromise is described as a supply chain attack via the official distribution site.▾
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Uncertain4 lines
The identity and attribution of the threat actor(s) behind the compromise is not stated.▾
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The number of users who downloaded and executed the malicious installers is unknown.▾
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The full capabilities and command-and-control infrastructure of the Python RAT are not detailed in the article.▾
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Whether the website has been restored to a clean state is not confirmed.▾
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Timeline
Status Change7 Jun 2026, 19:51
Lifecycle changed
signal → closed
Closure7 Jun 2026, 19:51
Event Closed
hygiene_sweep_stale
Initial Detection10 May 2026, 22:15
Initial Detection
The official website for JDownloader, a widely used open-source download manager, was compromised earlier in the week of 9 May 2026. Threat actors replaced legitimate Windows and Linux installers with malicious versions. The Windows payload was found to deploy a Python-based remote access trojan (RAT), potentially exposing a large number of end users globally to system compromise.
The website for the popular JDownloader download manager was compromised earlier this week to distribute malicious Windows and Linux installers, with the Windows payload found deploying a Python-based remote access trojan.
Source: BleepingComputer (Trade Media) · View source
Lloyd's classifications
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