CVE-2026-40880
Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1025 |
| Vendor | zcashfoundation |
| Product | zebrad |
| Published | Apr 21, 2026 |
| Last Updated | Apr 21, 2026 |
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Affected Versions
ZcashFoundation / zebrad
< 4.3.1
ZcashFoundation / zebra-consensus
< 5.0.2