CVE-2026-44498
High
Description
ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductZfnd Zebrad
PublishedMay 8, 2026
First seenMay 8, 2026
Weakness typeCWE-682CWE-682
How to fix
Update
- zfnd zebrad4.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zfnd zebrad | v < 4.4.0 | 4.4.0 |
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