critical7.5
CVE-2026-44498
Zebra's Block Validator Undercounts Coinbase and P2SH Sigops
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | zebrad | < 4.4.0 | 4.4.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Zfnd | Zebrad | before 4.4.0 |