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EUVD-2026-291271

fkie_cve-2026-34069

nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. In versions 1.2.2 and below, an unauthenticated p2p peer can cause the RequestMacroChain message handler task to panic. Sending a RequestMacroChain message where the first locator hash on the victim’s main chain is a micro block hash (not a macro block hash) causes said panic. The RequestMacroChain::handle handler selects the locator based only on "is on main chain", then calls get_macro_blocks() and panics via .unwrap() when the selected hash is not a macro block (BlockchainError::BlockIsNotMacro). This issue has been fixed in version 1.3.0.

GHSA-48m6-486p-9j8p — nimiq-consensus panics via RequestMacroChain micro-block locator

Affected: crates.io: nimiq-consensus

### Impact An unauthenticated p2p peer can cause the `RequestMacroChain` message handler task to panic by sending a `RequestMacroChain` message where the first locator hash that is on the victim’s main chain is a micro block hash (not a macro block hash).

In `RequestMacroChain::handle`, the handler selects the locator based only on "is on main chain", then calls `get_macro_blocks()` and panics via `.unwrap()` when the selected hash is not a macro block (`BlockchainError::BlockIsNotMacro`).

### Patches The patch for this vulnerability](https://github.com/nimiq/core-rs-albatross/pull/3660) is formally released as part of [v1.3.0](https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0).

### Workarounds No known workarounds.