CVE-2026-52733: zebrad has persistent on-disk corruption of Sapling/Orchard subtree roots after chain fork via pop_tip

July 2, 2026

When pop_tip removes the tip block during a chain fork, stale Sapling and Orchard note commitment subtree root data is retained in the in-memory non-finalized state. When the chain subsequently finalizes, this stale data is written to the persistent RocksDB state. The corrupted subtree root history affects z_getsubtreesbyindex (used by lightwalletd for wallet synchronization) and could affect future chain verification that depends on correct subtree roots.

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Code Behaviors & Features

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