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CVE-2026-40093 — Vulnerability in nimiq-blockchain — CVE Details

CRITICAL

nimiq-blockchain is missing a wall-clock upper bound on block timestamps

Published April 10, 2026Updated April 10, 2026Source: osv

Summary

### Impact 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. ### Patches TBD ### Workarounds No know workarounds.

Advisory Timeline

  • First published April 10, 2026 (185 days ago).
  • Last revised April 10, 2026 — 0 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
nimiq-blockchain
crates.io
All versionsRange-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-40093?
nimiq-blockchain is missing a wall-clock upper bound on block timestamps This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-40093?
CVE-2026-40093 affects nimiq-blockchain. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-40093 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-49xc-52mp-cc9j

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