GHSA-2fcv-qww3-9v6h: Babylon's malformed vote extensions are not rejected

November 24, 2025 (updated November 27, 2025)

Adversarial validators can send large vote extensions by using non-existing protobuf tags. This will result in the rejection of the subsequent block proposal. Eventually, all block proposals will be rejected by all validators.

References

github.com/advisories/GHSA-2fcv-qww3-9v6h
github.com/babylonlabs-io/babylon
github.com/babylonlabs-io/babylon/pull/1873/commits/86f38abd2dca5a656195a9954bb569a08d662e2b
github.com/babylonlabs-io/babylon/releases/tag/v4.1.0
github.com/babylonlabs-io/babylon/security/advisories/GHSA-2fcv-qww3-9v6h

Code Behaviors & Features

Detect and mitigate GHSA-2fcv-qww3-9v6h with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →