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EUVD-2026-326384

2026-10-10T11:36:08.730340+00:00

EUVD-2026-326384

fkie_cve-2026-46539

2026-10-10T11:36:08.730377+00:00

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.4.0, a logic flaw in BlockInclusionProof::is_block_proven causes the function to return true without performing any cryptographic verification when get_interlink_hops yields an empty hop list. This occurs when the target block is at the election block position immediately preceding the election head's epoch. An attacker providing transaction inclusion proofs can forge a MacroBlock header for that epoch position and have it accepted as "proven" without any hash or signature verification. This issue has been patched in version 1.4.0.

GHSA-799f-29jm-gr6c — nimiq-primitives: BlockInclusionProof interlink issue when hops are empty

2026-10-10T11:36:08.730416+00:00

Affected: crates.io: nimiq-primitives

### Impact A logic flaw in `BlockInclusionProof::is_block_proven` causes the function to return true without performing any cryptographic verification when `get_interlink_hops` yields an empty hop list. This occurs when the target block is at the election block position immediately preceding the election head's epoch. An attacker providing transaction inclusion proofs can forge a MacroBlock header for that epoch position and have it accepted as "proven" without any hash or signature verification.

### Patches [The patch for this vulnerability](https://github.com/nimiq/core-rs-albatross/pull/3705) is formally released as part of [v1.4.0](https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0).

### Workarounds No Workarounds

### Resources See [PR](https://github.com/nimiq/core-rs-albatross/pull/3705).