Name: ASA-2025-004: Non-deterministic JSON Unmarshalling of IBC Acknowledgement can result in a chain halt Component: IBC-Go Criticality: Critical (Considerable Impact; Almost Certain Likelihood per ACMv1.2) Affected versions: IBC-Go >= v7; Earlier IBC-Go versions may also be affected. Affected users: Validators, Full nodes, IBC Middleware authors
The ibc-go module is affected by the Inter-Blockchain Communication (IBC) protocol "Huckleberry" vulnerability.
Through the deployment and subsequent use of a malicious CosmWasm contract via IBC interactions, an attacker could potentially execute the same MsgTimeout inside the IBC hook for the OnTimeout callback before the packet commitment is deleted. On chains where ibc-hooks wraps ICS-20, this vulnerability may allow for the logic of the OnTimeout callback of the transfer application to be recursively executed, leading to a condition that may present the opportunity …