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CVE-2026-40880

Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Zcashfoundation Zfnd
Products
Zebra-consensus Zebrad Zebra-consensus and 1 more
CVE-2026-34377

Zebra has a Consensus Failure due to Improper Verification of V5 Transactions

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.

CVSS 4.0 · 8.4 High EPSS < 1% KEV · Not listed
Vendors
Zcashfoundation Zfnd
Products
Zebra Zebra-consensus Zebra and 1 more