Researcher Discloses CometBFT Zero-Day Affecting Cosmos Networks Securing Over $8 Billion

Security researcher Doyeon Park states that a CVSS 7.1 CometBFT zero-day can freeze Cosmos nodes during block synchronization, prompting validators to avoid restarts until a patch is released.

Summary

Security researcher Doyeon Park disclosed a high-risk zero-day vulnerability in CometBFT, the consensus layer used by Cosmos-based networks, affecting chains securing more than $8 billion in assets. The flaw has a CVSS 7.1 severity rating and can freeze nodes during block synchronization, disrupting chain operation, but Park said it cannot directly steal assets. Park advised Cosmos validators not to restart nodes until a patch is available, adding an immediate mitigation step to the previously reported risk.

Terms & Concepts
  • CometBFT: A blockchain consensus engine used by Cosmos-based networks to validate blocks and keep distributed nodes synchronized.
  • Zero-day vulnerability: A previously undisclosed software flaw that can be exploited or cause harm before a patch is widely available.
  • Block synchronization: The process by which blockchain nodes catch up with and verify the latest blocks to maintain network state.