# CVE-2026-40583

## Summary

- **CVE ID:** CVE-2026-40583
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/U:Red)
- **CWE:** CWE-460, CWE-696
- **Published:** Apr 21, 2026
- **Last Modified:** Apr 21, 2026

## 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.

## Affected Products

- UltraDAGcom — core (= 0.1)

## References

- [CNA](https://github.com/UltraDAGcom/core/security/advisories/GHSA-q8wx-2crx-c7pp)
- [CNA](https://github.com/UltraDAGcom/core/commit/2f5a3a237ea519b48d71e6e3093c89f60694c7be)
- [CNA](https://github.com/UltraDAGcom/core/commit/45bcf7064741897319b6196d3d9f9e1307093511)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 30.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._