Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M
CVE-2026-40583UltraDAG: SmartOp Vote Path Triggers Fatal Supply Invariant Halt
High 8.8
In plain English
A high-severity security flaw in core from UltraDAGcom. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Severity (CVSS 4.0)8.8High
Exploit odds (30 days)0.4%top 68.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| UltraDAGcom | core | = 0.1 |
Weakness: CWE-460, CWE-696 · Vector: 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