The XRP Ledger has implemented a new amendment known as fixCleanup3_4_0, addressing a critical flaw related to issued token permissions. The amendment became active on November 4 at 14:52 UTC
The XRP Ledger has implemented a new amendment known as fixCleanup3_4_0, addressing a critical flaw related to issued token permissions. The amendment became active on November 4 at 14:52 UTC, at ledger 108,112,129, after meeting the network’s validator approval requirements.
The fixCleanup3_4_0 amendment corrects a previously undisclosed vulnerability in the XRP Ledger’s permission delegation mechanism. This system enables account holders to grant limited transactional permissions to other accounts, such as allowing trusted services to manage redemptions for stablecoins or other issued tokens.
At the center of the flaw was the “PaymentBurn” permission. Under this system, an account could be permitted only to destroy tokens (for example, when burning stablecoins during redemption). However, the old logic unintentionally allowed these burn-only accounts to create new issued tokens when burning transactions caused the account’s balance to move from zero.
With the amendment, any PaymentBurn transaction that would cross a zero balance—potentially enabling unauthorized token creation—is now automatically rejected by the protocol.
The flaw sat inside the ledger’s permission delegation system. This system lets account holders allow other accounts to carry out specific transactions without giving up full control.
Assets impacted by the fix include trust-line issued tokens, stablecoins, and Multi-Purpose Tokens. XRP itself was never impacted, as it is not governed by the same permissioning rules as tokens issued through the network’s trust-line system. Public disclosures indicate that no exploitation of this bug has been confirmed, and no issuers have reported unauthorized creation of tokens as a result of the flaw.
Although the patch was integrated into version 3.4.0 of the XRP Ledger server software in September, protocol rules require that any amendment obtain the support of at least 80% of trusted validators for 14 consecutive days before activation. The initial voting period began on October 9, positioning the fix for late-October activation.
During this window, support briefly dipped below the threshold on October 21, causing the 14-day approval clock to reset. A new consensus among validators formed later that day, and the required two-week period was completed on November 4, triggering the successful activation of the amendment.
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Alongside the main bug fix, the amendment introduces further refinements to how the network processes certain transactions. For automated market makers, adjustments were made to ensure clawbacks do not destroy liquidity provider tokens in scenarios where rounding logic could inadvertently penalize issuers without adequate compensation.
Permissioned trading rules have also been clarified, blocking accounts from acquiring restricted tokens through certain offers. Escrow reserves, Multi-Purpose Token authorization procedures, and the construction of transaction signatures now feature added safeguards. Separate signing prefixes will prevent signatures intended for one role from being incorrectly used elsewhere.
Accounting and logic fixes have been applied to the still-under-development Single Asset Vaults and the XRP Ledger lending protocol. These changes address scenarios involving deposits, withdrawals, overdue payments, and the impact of impaired loans. However, lending features themselves remain inactive until further voting and amendment approvals are completed.
Some signing steps had used overlapping authorization structures. The update adds distinct signing prefixes so a signature meant for one transaction role cannot be reused in another.
Ripple has publicly supported the suite of lending amendments, which would allow brokers to set up fixed-term loans using assets deposited into vaults. Each lending protocol amendment must undergo its own separate approval process, including a two-week validator consensus, before it can be introduced on the main network.
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