# CVE-2026-34067

> Vulnerability · severity: **LOW** (CVSS 3.1).

## Description

nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryTreeProof::verify` panics on a malformed proof where `history.len() != positions.len()` due to `assert_eq!(history.len(), positions.len())`. The proof object is derived from untrusted p2p responses (`ResponseTransactionsProof.proof`) and is therefore attacker-controlled at the network boundary until validated. A malicious peer could trigger a crash by returning a crafted inclusion proof with a length mismatch. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.

## Key facts

- **CVE ID:** CVE-2026-34067
- **Published:** 2026-04-22
- **CVSS severity:** LOW
- **CVSS base score:** 3.1
- **CWE codes:** CWE-617

## Affected products

- `nimiq:nimiq_proof-of-stake`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34067

## Citation

> AI Analytics. CVE-2026-34067. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-34067. Derived from NIST NVD. Licensed CC0.

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