CVE-2026-46369: Nimiq Core-RS-Albatross

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Through 1.5.0, the validity store uses a strict lower-bound comparison that expires a stored transaction too early relative to Transaction::is_valid_at, allowing a remote attacker to replay the same signed transaction during a blocks_per_batch minus one block window and cause the sender and recipient balances to be updated twice. This issue is fixed in version 1.5.1.

Affected products

• Nimiq Core-RS-Albatross: before 1.5.1 (fixed in 1.5.1)

Published 2026-08-26. Last modified 2026-09-09.