Babylon vulnerable to chain halt when a message modifies the validator set at the epoch boundary
Date: 2025-07
Affected: go/github.com/babylonlabs-io/babylon/v2
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CWE: CWE-754

### Summary Sending a message that modifies the validator set at the epoch boundary halts the chain. ### Impact Denial of Service - Comos-sdk prevents modifying the validator set from two different modules - https://github.com/cosmos/cosmos-sdk/blob/release/v0.50.x/types/module/module.go#L811. Such an operation leads to panic and chain halt. ### Detailed Post mortem https://boiling-lake-106.notion.site/2025-06-18-Genesis-mainnet-chain-halt-post-mortem-229f60cc1b5f80b7adf5e3ea0541ea87


Mitigations:

Architectural layers (MAESTRO):