CVE-2026-34066 Details
Description
nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryStore::put_historic_txns` uses an `assert!` to enforce invariants about `HistoricTransaction.block_number` (must be within the macro block being pushed and within the same epoch). During history sync, a peer can influence the `history: &[HistoricTransaction]` input passed into `Blockchain::push_history_sync`, and a malformed history list can violate these invariants and trigger a panic. `extend_history_sync` calls `this.history_store.add_to_history(..)` before comparing the computed history root against the macro block header (`block.history_root()`), so the panic can happen before later rejection checks run. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.
A denial-of-service vulnerability has been identified in the Nimiq blockchain's Rust implementation, specifically in versions through 1.2.2. The issue arises in the 'HistoryStore::put_historic_txns' function, where an 'assert!' is used to validate 'HistoricTransaction.block_number' against certain invariants. During the history synchronization process, a peer can manipulate the 'history' input passed to 'Blockchain::push_history_sync'. If the history list is malformed, it can violate the invariants and cause a panic. This vulnerability allows a malicious peer to crash a syncing node by sending 'HistoricTransaction' objects with invalid block numbers that disrupt the expected epoch and batch rules.
Users can upgrade to Nimiq Blockchain version 1.3.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 23, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
| CWE-617 | Reachable Assertion | [email protected] |
| CWE-754 | Improper Check for Unusual or Exceptional Conditions | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nimiq nimiq proof-of-stake | < 1.3.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 24, 2026 | Initial Analysis | [email protected] |
| Apr 22, 2026 | New CVE Received | [email protected] |