CVE-2026-42278
UltraDAG: Smart Account Spending Policy Bypass via Pockets
Description
UltraDAG is a minimal DAG-BFT blockchain in Rust. Prior to commit fb6ef59, the UltraDAG StateEngine implementation of SmartTransferTx contains a critical logic flaw in its policy enforcement pipeline. When a transaction originates from a "Pocket" (a derived sub-address documented in the protocol as a way to organize funds), the engine fails to resolve the pocket's parent account before checking the spending policy. Because pockets are "virtual" addresses that exist only as entries in the pocket_to_parent map and do not have their own SmartAccountConfig entries, the check_spending_policy method defaults to an "authorized/no policy" result. This allow any user (or attacker in possession of a parent key) to instantly drain every pocket on an account, even if the parent account has a strict 24-hour vault delay or a 1 UDAG daily limit. This issue has been patched via commit fb6ef59.
INFO
Published Date :
May 8, 2026, 5:16 a.m.
Last Modified :
Oct. 26, 2026, 7:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update UltraDAG to the latest version.
- Apply commit fb6ef59.
- Review transaction policy enforcement logic.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42278.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42278 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42278
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42278 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42278 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: core de UltraDAGcom, Description: UltraDAG es una blockchain DAG-BFT mínima en Rust. Antes del commit fb6ef59, la implementación del StateEngine de UltraDAG de SmartTransferTx contiene un fallo lógico crítico en su pipeline de aplicación de políticas. Cuando una transacción se origina desde un ’Pocket’ (una subdirección derivada documentada en el protocolo como una forma de organizar fondos), el motor no logra resolver la cuenta padre del pocket antes de verificar la política de gasto. Debido a que los pockets son direcciones ’virtuales’ que existen solo como entradas en el mapa pocket_to_parent y no tienen sus propias entradas de SmartAccountConfig, el método check_spending_policy por defecto resulta en ’autorizado/sin política’. Esto permite a cualquier usuario (o a un atacante en posesión de una clave padre) drenar instantáneamente cada pocket de una cuenta, incluso si la cuenta padre tiene un estricto retraso de bóveda de 24 horas o un límite diario de 1 UDAG. Este problema ha sido parcheado mediante el commit fb6ef59. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'UltraDAGcom', 'product': 'core', 'versions': [{'status': 'affected', 'version': '< fb6ef59d6c1385400e7acea7ae31fc6a473c3051'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-42278', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-08T23:15:23.571023Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 09, 2026
Action Type Old Value New Value Added Reference https://github.com/UltraDAGcom/core/security/advisories/GHSA-9chc-gjfr-6hrq -
New CVE Received by [email protected]
May. 08, 2026
Action Type Old Value New Value Added Description UltraDAG is a minimal DAG-BFT blockchain in Rust. Prior to commit fb6ef59, the UltraDAG StateEngine implementation of SmartTransferTx contains a critical logic flaw in its policy enforcement pipeline. When a transaction originates from a "Pocket" (a derived sub-address documented in the protocol as a way to organize funds), the engine fails to resolve the pocket's parent account before checking the spending policy. Because pockets are "virtual" addresses that exist only as entries in the pocket_to_parent map and do not have their own SmartAccountConfig entries, the check_spending_policy method defaults to an "authorized/no policy" result. This allow any user (or attacker in possession of a parent key) to instantly drain every pocket on an account, even if the parent account has a strict 24-hour vault delay or a 1 UDAG daily limit. This issue has been patched via commit fb6ef59. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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:X/V:X/RE:X/U:X Added CWE CWE-284 Added CWE CWE-639 Added Reference https://github.com/UltraDAGcom/core/commit/fb6ef59d6c1385400e7acea7ae31fc6a473c3051 Added Reference https://github.com/UltraDAGcom/core/security/advisories/GHSA-9chc-gjfr-6hrq