# CVE-2026-40583

> Vulnerability · severity: **HIGH** (CVSS 8.2).

## Description

UltraDAG is a minimal DAG-BFT blockchain in Rust. In version 0.1, a non-council attacker can submit a signed SmartOp::Vote transaction that passes signature, nonce, and balance prechecks, but fails authorization only after state mutation has already occurred.

## Key facts

- **CVE ID:** CVE-2026-40583
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 8.2
- **CWE codes:** CWE-460, CWE-696

## Affected products

- `ultradag:ultradag`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40583

## Citation

> AI Analytics. CVE-2026-40583. Retrieved 2026-07-15 from https://api.ai-analytics.org/cve/CVE-2026-40583. Derived from NIST NVD. Licensed CC0.

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