An emergency update for the XRP Ledger protocol has been released after a critical bug was discovered in its payment engine, posing severe risks to the XRP supply. xrpld version 3.4.1, launched on September 25, 2026, addresses this serious vulnerability, which allowed attackers to mint new spendable XRP through a single transaction.
Overflow bug details and risk
A researcher reported the vulnerability to the XRPL Bug Bounty program on September 22, 2026. The flaw, an integer overflow in the payment engine, could be exploited by an attacker to create XRP out of thin air using a combination of specially crafted offers and one payment.
The technical issue occurred when the payment engine added up amounts from a payment that consumed numerous offers from the order book. If the resulting sum exceeded the maximum integer value allowed for XRP balances, it wrapped around to a small number instead of triggering an error.
As a result, offer owners received the correct payment individually, but the buyer was charged only the wrapped-around total. The remaining amount, effectively phantom XRP, would be credited to the buyer. This XRP, which should not exist, behaved like legitimate tokens and could be moved, traded, or sent to exchanges.
While the XRP Ledger protocol includes an invariant—a built-in safety check—designed to prevent the creation of new XRP in transactions, the overflow situation mirrored the behavior of actual sums, so the safety system failed to detect the abnormal increase.
Although the bug existed since the payment engine’s current architecture was written in 2015, no one had identified or reported it until it surfaced last month.
Patch deployment and network status
xrpld 3.4.1 introduces an immediate fix for the overflow issue. Security teams found no evidence that this vulnerability was exploited on any public network, and the bug’s presence did not result in unexpected XRP creation historically.
Given the magnitude of the threat, project maintainers bypassed the normal amendment proposal process for the first time since the amendment framework was introduced over a decade ago. This step ensured the fix became effective with the release of v3.4.1 and did not require a consensus vote from node operators.
Operators of XRPL servers have been urged to update immediately to v3.4.1 to remain synchronized with the network and protect against attempts to exploit this vulnerability.
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