CVE-2026-40093 (GCVE-0-2026-40093)

Vulnerability from cvelistv5 – Published: 2026-04-09 20:29 – Updated: 2026-04-13 15:38
VLAI
Title
nimiq-blockchain is missing a wall-clock upper bound on block timestamps
Summary
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.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 15:05 UTC
CWE
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
nimiq core-rs-albatross Affected: <= 1.3.0
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