CVE-2026-34066
Last modified
CVE-2026-34066 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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). EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nimiq | Nimiq Proof-Of-Stake | < 1.3.0 |
References
- https://github.com/nimiq/core-rs-albatross/pull/3656Issue Tracking, Patch
- https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-j99g-7rqw-q9jgPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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