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x402 SDKs found with critical vulnerabilities enabling wallet drain

By PulseAugur Editorial · [1 sources] ·

Security firm V12 discovered 25 vulnerabilities, including three critical ones, in the x402 SDKs, which could allow malicious APIs to drain an AI agent's wallet. One critical vulnerability involved a missing default spending limit, enabling an agent to sign for the wallet's full balance. Other critical issues included misinterpreting Solana token approvals as payments and signing login messages for unauthorized websites. While fixes were released in August 2026, no CVE or GitHub advisory was issued, and npm audit did not flag the vulnerabilities. AI

IMPACT Highlights critical security risks in AI agent wallet interactions, emphasizing the need for robust security measures and auditing.

RANK_REASON Security research disclosure detailing vulnerabilities in an SDK. [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

x402 SDKs found with critical vulnerabilities enabling wallet drain

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29 / 100
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Tool
Security research disclosure detailing vulnerabilities in an SDK. [lever_c_demoted from research: ic=1 ai=1.0]
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safety, product
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High
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Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · ScriptMasterLabs ·

    Can a Malicious API Drain an AI Agent's Wallet With x402? 25 Vulnerabilities, 3 Critical

    <h1> Can a Malicious API Drain an AI Agent's Wallet With x402? 25 Vulnerabilities, 3 Critical </h1> <p>Yes — with the pre-fix default client, it could ask for the wallet's full balance and an auto-signing agent with no app-set policy would sign it: security firm V12 disclosed on …

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