GHSA-xqqc-c5gw-c5r5

### Impact Anyone using the `tendermint-light-client` and related packages to perform light client verification (e.g. IBC-rs, Hermes). At present, the light client does not check that the chain IDs of the trusted and untrusted headers match, resulting in a possible attack vector where someone who finds a header from an untrusted chain that satisfies all other verification conditions (e.g. enough overlapping validator signatures) could fool a light client. The attack vector is currently theoretical, and no proof-of-concept exists yet to exploit it on live networks. ### Patches Users of the light client-related crates can currently upgrade to `v0.28.0`. ### Workarounds None ### References - [Light Client specification](https://github.com/tendermint/tendermint/tree/main/spec/light-client)