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CVE-2026-42278— UltraDAG: Smart Account Spending Policy Bypass via Pockets

Quick assessment

Affected
UltraDAGcom core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

UltraDAG是UltraDAGcom个人开发者的一个轻量级物联网区块链。 UltraDAG commit fb6ef59之前版本存在访问控制错误漏洞，该漏洞源于SmartTransferTx实现中的策略执行管道存在逻辑缺陷，未能解析口袋的父账户即检查支出策略，可能导致攻击者耗尽账户中的所有口袋。

AI Predicted 9.1 Difficulty: Easy EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
UltraDAGcom core < fb6ef59d6c1385400e7acea7ae31fc6a473c3051 affected
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I. Basic Information for CVE-2026-42278

Vulnerability Information
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Vulnerability Title
UltraDAG: Smart Account Spending Policy Bypass via Pockets
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
UltraDAG 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UltraDAG是UltraDAGcom个人开发者的一个轻量级物联网区块链。 UltraDAG commit fb6ef59之前版本存在访问控制错误漏洞，该漏洞源于SmartTransferTx实现中的策略执行管道存在逻辑缺陷，未能解析口袋的父账户即检查支出策略，可能导致攻击者耗尽账户中的所有口袋。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
UltraDAGcom core < fb6ef59d6c1385400e7acea7ae31fc6a473c3051 -

II. Public POCs for CVE-2026-42278

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III. Intelligence Information for CVE-2026-42278

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Patches & Fixes for CVE-2026-42278 (1)

Vendor Advisories for CVE-2026-42278 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: UltraDAGcom
Same weakness: CWE-284

V. Comments for CVE-2026-42278

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