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Vulnerability record · CVE-2026-40583 · published 21 April 2026

CVE-2026-40583: Ultradag vulnerability

Ultradag · Ultradag

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.

8.8 CVSS 4.0 High EPSS 0.57% · top 54.9% CWE-460 · CWE-460CWE-696 · CWE-696
8.8CVSS 4.0 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/UltraDAGcom/core/commit/2f5a3a237ea519b48d71e6e3093c89f60694c7be Patch
https://github.com/UltraDAGcom/core/commit/45bcf7064741897319b6196d3d9f9e1307093511 Patch
https://github.com/UltraDAGcom/core/security/advisories/GHSA-q8wx-2crx-c7pp ExploitMitigationVendor Advisory
https://github.com/UltraDAGcom/core/security/advisories/GHSA-q8wx-2crx-c7pp ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-40583), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.