CVE-2026-40093
Description
nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In 1.3.0 and earlier, block timestamp validation enforces that timestamp >= parent.timestamp for non-skip blocks and timestamp == parent.timestamp + MIN_PRODUCER_TIMEOUT for skip blocks, but there is no visible upper bound check against the wall clock. A malicious block-producing validator can set block timestamps arbitrarily far in the future. This directly affects reward calculations via Policy::supply_at() and batch_delay() in blockchain/src/reward.rs, inflating the monetary supply beyond the intended emission schedule.
How to fix
- nimiq nimiq_proof-of-stake1.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nimiq nimiq_proof-of-stake | v < 1.3.0 | 1.3.0 |
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