GHSA-x5vx-95h7-rv4p: 
vulnerability analysis and mitigation

The vulnerability (GHSA-x5vx-95h7-rv4p) affects the Cosmos SDK's Groups module, discovered in February 2025. This high-severity issue affects versions <= v0.47.15 and <= 0.50.11 of the Cosmos SDK, potentially impacting validators, full nodes, and users on chains utilizing the groups module (GitHub Advisory).

The vulnerability stems from a condition where a malicious proposal could trigger a division by zero operation in the Groups module, resulting in a chain halt due to the resulting error. The issue has been assigned a high severity rating with a CVSS score of 8.7, indicating significant impact potential. The vulnerability is classified under CWE-369 (Divide By Zero) (GitHub Advisory).

The primary impact of this vulnerability is the potential for complete chain halting. Any user with access to interact with the groups module could potentially introduce this state, making it a significant threat to network availability (GitHub Advisory).

The vulnerability has been patched in Cosmos SDK versions v0.47.16 and v0.50.12. There are no known workarounds for this issue, and it is strongly recommended that affected chains apply the update. When upgrading from affected versions, a chain upgrade is necessary to ensure that 2/3 of the validator power upgrades to the patched version (SDK Release, SDK Release).