critical9.1
CVE-2026-40093
nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | nimiq-blockchain | <= 1.3.0 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nimiq | Nimiq Proof-Of-Stake | before 1.3.0 |