CVE-2026-34066

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryStore::put_historic_txns` uses an `assert!` to enforce invariants about `HistoricTransaction.block_number` (must be within the macro block being pushed and within the same epoch). During history sync, a peer can influence the `history: &[HistoricTransaction]` input passed into `Blockchain::push_history_sync`, and a malformed history list can violate these invariants and trigger a panic. `extend_history_sync` calls `this.history_store.add_to_history(..)` before comparing the computed history root against the macro block header (`block.history_root()`), so the panic can happen before later rejection checks run. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.

The following products are affected by CVE-2026-34066 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34066.

URL	Resource
https://github.com/nimiq/core-rs-albatross/commit/6f5511309c199d84b012fe6b9aba7e5582892c50
https://github.com/nimiq/core-rs-albatross/pull/3656
https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0
https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-j99g-7rqw-q9jg