# CVE-2026-34064

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## Description

nimiq-account contains account primitives to be used in Nimiq's Rust implementation. Prior to version 1.3.0, `VestingContract::can_change_balance` returns `AccountError::InsufficientFunds` when `new_balance < min_cap`, but it constructs the error using `balance: self.balance - min_cap`. `Coin::sub` panics on underflow, so if an attacker can reach a state where `min_cap > balance`, the node crashes while trying to return an error. The `min_cap > balance` precondition is attacker-reachable because the vesting contract creation data (32-byte format) allows encoding `total_amount` without validating `total_amount <= transaction.value` (the real contract balance). After creating such a vesting contract, the attacker can broadcast an outgoing transaction to trigger the panic during mempool admission and block processing. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.

## Key facts

- **CVE ID:** CVE-2026-34064
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-191

## Affected products

- `nimiq:nimiq_proof-of-stake`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34064

## Citation

> AI Analytics. CVE-2026-34064. Retrieved 2026-07-22 from https://api.ai-analytics.org/cve/CVE-2026-34064. Derived from NIST NVD. Licensed CC0.

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