Hackers Publish Malicious Python Package Mimicking Legitimate Parsimonious Parser

Cybersecuritynews •Tushar Subhra Dutta • June 5, 2026

A deceptive Python package quietly made its way into the PyPI repository, putting thousands of developers at risk before it was caught and removed. The package, named “parsimonius,” was crafted to look almost identical to the widely used “parsimonious” library, a popular Python tool for building expression grammar parsers. The single missing letter was no […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Typosquatting Attack Targets Python Developers with Malicious Package A malicious Python package named 'parsimonius' was uploaded to the Python Package Index (PyPI), mimicking the legitimate 'parsimonious' library. This typosquatting attack exploited developer trust, leading to 2,474 downloads before removal. The rogue package was designed to pass basic import tests while embedding a Telegram-based backdoor for remote access and data theft. The attack highlights vulnerabilities in automated dependency resolution systems, where higher version numbers are prioritized without manual checks. Developers and organizations using the legitimate library are at risk of compromise due to the potential installation of the malicious package. The incident reflects a broader trend of supply chain attacks targeting popular open-source libraries. 3 sources 69

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Hackers Publish Malicious Python Package Mimicking Legitimate Parsimonious Parser

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