EUVD-2026-21146
GHSA-49xc-52mp-cc9j
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
3Description
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.
Analysis
Timestamp manipulation in Nimiq Core Rust implementation (nimiq-blockchain 1.3.0 and earlier) allows authenticated block-producing validators to set arbitrarily future block timestamps, bypassing validation constraints and directly inflating the blockchain's monetary supply beyond the intended emission schedule through compromised Policy::supply_at() and batch_delay() reward calculations. The vulnerability exploits absent upper-bound wall-clock validation in non-skip and skip block timestamp verification logic, enabling integrity compromise of the blockchain's economic model. …
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Remediation
Within 24 hours: Identify all systems running nimiq-blockchain version 1.3.0 or earlier and assess validator node status. Within 7 days: Isolate or revoke signing privileges for any validators until a patch is released; contact Nimiq development team for availability timeline and interim mitigations. …
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