PyPI Fixes High-Severity Access Control Issues Found in Security Audit

PyPI has addressed two high-severity security flaws identified during an external audit by Trail of Bits, funded by the Sovereign Tech Agency, which focused on the Warehouse application that powers PyPI. These flaws involved access control issues, where organization members could invite new owners through a loophole in permission settings, and stale team permissions that persisted after project transfers, potentially allowing unauthorized access. The audit, conducted from February to March 2026, revealed 14 findings, including issues with authentication, metadata consistency, and authorization enforcement. PyPI has since remedied most of these issues, implementing changes like stricter permission requirements for role invitations and deleting outdated team project roles during transfers. However, an unresolved issue remains with the validation of metadata embedded in wheel files, which could lead to discrepancies between declared and actual package dependencies. The audit underscores the importance of ongoing funding for the security of open-source projects, as demonstrated by the critical role of the Sovereign Tech Agency's support in enabling PyPI to address these vulnerabilities.

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