CVE-2026-40093 — nimiq-blockchain is missing a wall-clock upper bound on block timestamps

Description (CNA)

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 (CNA)

Vendor / product	Versions
nimiq / core-rs-albatross	affected <= 1.3.0

CWE

CWE-1284

References

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.