Litecoin Core v0.21.5.5 Released With MWEB Consensus Hardening and Security Fixes

The Litecoin project released Litecoin Core v0.21.5.5 on May 6, 2026. The patch update includes fixes for MWEB validation and state handling, as well as changes intended to harden amount and fee calculations.

The release also contains chainstate recovery and crash-recovery improvements. It addresses a range of operational components, including peer-to-peer networking, mining, wallet functionality and RPC.

Litecoin recommends that node operators and wallet users upgrade to the new version, with particular emphasis on miners, mining pools and users of MWEB.

MWEB validation and state-handling changes

The v0.21.5.5 release includes MWEB-related validation and state-handling fixes. It also contains overflow-related improvements and hardening for amount and fee calculations.

These changes concern software behavior at the node level. The release notes identify MWEB users among the groups the project particularly encourages to upgrade.

• MWEB validation fixes
• MWEB state-handling improvements
• Amount and fee calculation hardening
• Overflow-related fixes

Network, chainstate and operational updates

Litecoin Core v0.21.5.5 raises the maximum P2P protocol message length to 32 MB. The release additionally includes chainstate recovery improvements and changes intended to improve crash recovery and general reliability.

The update carries fixes and maintenance work affecting mining, wallets and RPC, alongside build and test updates. Previous coverage has also tracked Litecoin Core MWEB hardening work.

• Maximum P2P message size set at 32 MB
• Chainstate recovery improvements
• Mining, wallet and RPC fixes
• Reliability, build and test changes

Upgrade and verification guidance

The project recommends the release for node operators and wallet users, particularly miners, pools and people using MWEB. Operators should review the official release materials before deploying software in their own environments.

The official release page provides downloadable binaries and SHA-256 hashes, allowing users to verify distributed files. Litecoin Core releases continued to receive MWEB-focused maintenance in subsequent coverage.

• Review the release notes before upgrading
• Use the listed SHA-256 hashes to verify downloaded binaries
• Give particular attention to upgrades involving mining, pools and MWEB use

Continue reading: Litecoin Core MWEB hardening work on BTCNews.

Continue reading: MWEB-focused maintenance in subsequent coverage on BTCNews.

Sources

• Litecoin Project on GitHub: Release Litecoin Core v0.21.5.5

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