Ripple has achieved a significant milestone for the forthcoming decentralized finance (DeFi) capabilities on the XRP Ledger. Leading Web3 security firm Halborn recently concluded a comprehensive re-audit of the XRPL Lending Protocol, confirming that all reported findings from earlier reviews have been addressed or strategically managed by the core engineering team.
The Lending Protocol, codified under the XLS-0066d standard, is a foundational DeFi primitive designed to enable fixed-term, uncollateralized on-chain loans utilizing pooled funds from a Single Asset Vault.
The scope of the re-audit
Between mid-December 2025 and January 2026, Halborn conducted a diff-based re-audit, focusing explicitly on the significant codebase modifications introduced since the protocol's prior summer audit.
The primary objective was to validate the security and correctness of the updated implementation against the XLS-0066d specification. Halborn’s team evaluated transaction validation logic, state consistency, parameter checks, and access controls. The security firm employed a layered analysis approach that included specification reviews, code-diff analysis, manual code inspection, and automated static analysis to evaluate the XRP Ledger's three-stage transaction processing model.
Resolution of findings
The re-audit report categorized the identified issues, resulting in zero critical or high-severity vulnerabilities. Halborn detailed five specific findings, all of which were transparently addressed or accepted by Ripple.
Halborn identified a missing validation check that could have allowed a vault's total assets to exceed its configured maximum limit through the accumulation of loan interest. Ripple confirmed this was solved, noting that the engineering team had coincidentally caught and fixed the issue internally prior to the audit's commencement.
The audit discovered that users could theoretically create a LoanBroker on a frozen vault, wasting reserve funds on an unusable setup. Ripple solved this by adding the appropriate freeze check to the transaction's preclaim stage.
With 100% of the reported findings formally addressed, acknowledged, or accepted, the successful re-audit clears a major technical hurdle for the XRPL Lending Protocol.
U.Today Editorial Team
Dan Burgin
