Hermes Agent v0.21.2 Released to Fix state.db Corruption After v0.21.0 Update

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NousResearch released Hermes Agent v0.21.2 on September 11, 2026, as a targeted patch addressing database corruption issues introduced in v0.21.0. The v0.21.0 update had overhauled the session management system, which inadvertently made state.db vulnerable in certain installations. Affected users reported three symptoms: write-lock conflicts causing transaction cancellations, healthy databases being falsely flagged as corrupted, and a single bad row breaking the entire session-listing command. The team resolved four root causes, including separating hosted-room state into its own database, making the dashboard open read-only initially, routing cron lifecycle checks through a connection tracker, and preventing the repair command from running unless safety can be confirmed. Users still on v0.21.0 or v0.21.1 experiencing database issues are advised to upgrade immediately, though the patch will not automatically repair files already corrupted.

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