CVE-2026-44498
High · 7.5CVSS
7.5
EPSS
0.4%
Published
May 8, 2026
CISA due date
—
The record
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 | Introduced | Fixed |
|---|---|---|---|
| crates.io | zebrad | 0 | 4.4.0 |
Related vulnerabilities
- GHSA-jv4h-j224-23cc Zebra's Block Validator Undercounts Coinbase and P2SH Sigops Same vulnerability
- GHSA-h9hm-m2xj-4rq9 Zebra has Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning Also affects zebrad
- GHSA-pvmv-cwg8-v6c8 Zebra v4.4.0 still accepts V5 SIGHASH_SINGLE without a corresponding output Also affects zebrad
- CVE-2026-44499 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
- CVE-2026-44497 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
- CVE-2026-44500 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
- CVE-2026-41583 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
- CVE-2026-41584 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad