Synchronous vs Event-Driven AWS Architecture: How API Gateway, Lambda, and DynamoDB Connect

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In a synchronous cloud architecture, a caller sends a request to an API Gateway and waits for a response within the same invocation cycle. The API Gateway forwards the request by invoking an AWS Lambda function directly and synchronously. Lambda then queries a DynamoDB database to retrieve the required data, such as a specific user record. The result travels back through Lambda and API Gateway before being delivered to the original caller. This request-response flow means the caller remains blocked until the entire chain completes and a response is returned.

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Security Report Flags High Flash Loan Attack Risk on DeFi Protocol Portal

A DeFi security research team published an analysis on September 29, 2026, identifying six flash loan attack vectors targeting Portal, a cross-chain liquidity protocol with approximately $1.8 billion in total value locked across Ethereum L1 and L2. The report assigned Portal an aggregate risk score of 8 out of 10, placing it in the high-risk category. The most critical vulnerability involves oracle price manipulation, where an attacker could use a flash loan to distort Portal's time-weighted average price oracle and exploit mispriced collateral or liquidations, potentially draining up to 30 percent of TVL in a single transaction. Other significant risks include re-entrancy attacks through flash loan receiver callbacks and a 'liquidation sandwich' technique that could siphon collateral from borrowers. Researchers strongly recommended immediate remediation of oracle integrity safeguards and re-entrancy protections as priority measures.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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