ACINQ Merged Eclair Code to Prevent Fee Issues
The update secures nodes from paying excessive Bitcoin mining fees by improving transaction verification in dual-funded channels.
Updated on Oct. 12, 2026 in Quantum Computing
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Developer ACINQ has merged two code fixes into the Eclair master branch to resolve vulnerabilities related to high Bitcoin mining fees. The updates ensure nodes no longer face risks of paying arbitrary fees imposed by malicious peers in dual-funded channels.
Why it matters
This patch prevents potentially costly exploits where peers could force excessive mining fees on a node during transaction construction. These improvements secure network operations for Eclair users by enforcing stricter fee validation during the funding process.
The Eclair master branch now includes mechanisms to reject replacement transactions that exceed maximum funding fee rates. Additionally, the signer mode calculates exact fees based on inputs and outputs to verify values reported by Bitcoin Core.
The players
ACINQ
ACINQ is a prominent developer focused on Bitcoin Lightning Network infrastructure and payment solutions.
Eclair
Eclair is a leading open-source implementation of the Lightning Network protocol for Bitcoin transactions.
Bitcoin Core
Bitcoin Core is the primary software used to maintain the Bitcoin blockchain and process network transactions.
The details
The update limits fee rates in dual-funded channels and mandates that the Eclair-signer mode compares transaction fees with calculated totals. By verifying fees during transaction construction, the system blocks replacement transactions that attempt to bypass established fee limits.
Timeline
September 14, 2026: Eclair v0.14.3 was released.
October 2, 2026: The first fee-limiting fix was merged into the master branch.
October 5, 2026: The second fee-verification fix was merged into the master branch.
The Tech Race
This update reflects a shift toward more robust, trustless verification in decentralized financial protocols like the Lightning Network protocol dual-funded channels. By replacing reliance on peer-reported metrics with independent calculation, ACINQ aligns Eclair with broader trends toward hardening blockchain infrastructure against malicious actor interference.
Node operators running Eclair should update to the latest version to ensure they are protected against potential fee-based exploits in dual-funded channels. The update streamlines transaction safety without requiring complex manual verification from the user.
The takeaway
Maintaining updated software versions is essential for network nodes to defend against evolving security risks in decentralized systems. Users should verify their node's current configuration to ensure all recent security patches are successfully implemented.
Further reading
Learn more about the latest developments in Quantum Computing.
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Do you trust current cryptocurrency software to automatically protect your funds from excessive transaction fees?
