Malicious Python Package Mimics Parsimonious Parser

Gbhackers •Mayura Kathir • June 5, 2026

A sophisticated typosquatting attack targeting Python developers through a malicious package named “parsimonius” on the Python Package Index (PyPI). The rogue package was engineered to impersonate the legitimate parsimonious parsing library, a well-known tool for building recursive descent parsers in Python, by altering just a single character in the package name. The attack exemplifies a […]

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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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Malicious Python Package Mimics Parsimonious Parser

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Attack Types (1)

Malware (1)

MITRE ATT&CK (2)

Platforms (1)

Tools (1)