XRPL Lending Protocol Passes Re Audit With No Critical Issues

Clean Bill of Health From Halborn

The XRP Ledger's native Lending Protocol has passed a full re-audit by Web3 security firm Halborn with no critical or high-severity vulnerabilities identified. The engagement ran from December 16, 2025 to January 12, 2026, covering significant codebase changes since the protocol's initial summer 2025 assessment.

The re-audit was diff-based, focusing explicitly on the significant codebase modifications introduced since the prior summer audit. The objective was to validate the security and correctness of the updated protocol implementation against prior audit findings and the XLS-0066d specification, including verifying transaction validation logic, ensuring state consistency and accounting accuracy, and checking parameter validation and access controls. Halborn's team used a layered methodology combining specification review, code-diff analysis, manual inspection, and automated static analysis.

Ripple's technical team resolved all five specific findings detailed in the report. All previously flagged issues were confirmed as addressed or properly mitigated by Ripple's engineering team.

What the Audit Covered and Why It Matters

The Lending Protocol enables on-chain, fixed-term, uncollateralized loans using pooled funds from a Single Asset Vault, relying on off-chain underwriting and risk management to assess the creditworthiness of borrowers. One finding flagged during the re-audit was a missing validation check that could have allowed a vault's total assets to exceed its configured maximum through the accumulation of loan interest. Ripple confirmed the engineering team had caught and fixed the issue internally prior to the audit's commencement. A separate finding noted that users could theoretically create a LoanBroker on a frozen vault, wasting reserve funds. Ripple resolved this by adding the appropriate freeze check to the transaction's preclaim stage.

The clean re-audit result follows a broader testing campaign. Between March and May 2026, AI-assisted red-team testing produced 20 lending-related tickets, leading to the discovery and repair of seven confirmed bugs. RippleX also worked with Common Prefix on formal verification efforts, which uncovered subtle edge cases involving vault invariants, loan-payment assertions, arithmetic rounding errors, and specification inconsistencies. Halborn strongly recommends conducting a follow-up assessment either within six months or immediately following any material changes to the codebase, whichever comes first.

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 ahead of potential mainnet activation.

Sources:
Halborn: XRPL Lending Protocol Re-Audit Report
U.Today: Ripple Completes XRP Lending Protocol Re-Audit
Crypto Economy: Ripple Completes Re-Audit of XRP Lending Protocol