500+ Organizations Hit as Medusa Ransomware Tightens Grip on US Critical Infrastructure

The Medusa ransomware has impacted over 500 critical infrastructure organizations across multiple sectors in the US since 2021, with increasing activity noted since 2023. US agencies CISA, HHS, and FBI have issued warnings urging stronger cybersecurity measures including patching, network segmentation, and restricted remote access to mitigate these attacks.

This Wire brief sits within Fusion42's coverage of Cybersecurity, and 9 sources have reported it between 18 Aug 2026 and 21 Aug 2026.