CVE-2026-41583

The record

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between Zebra and zcashd nodes. In a similar vein, for V4 transactions, Zebra mistakenly used the "canonical" hash type when computing the sighash while zcashd (correctly per the spec) uses the raw value, which could also crate a consensus split. This issue has been patched in zebrad version 4.3.1 and zebra-script version 5.0.2.

Affected packages

Related vulnerabilities

• GHSA-8m29-fpq5-89jj Zebra Vulnerable to Consensus Divergence in Transparent Sighash Hash-Type Handling Same vulnerability
• GHSA-pvmv-cwg8-v6c8 Zebra v4.4.0 still accepts V5 SIGHASH_SINGLE without a corresponding output Also affects zebra-script
• CVE-2026-44497 ZEBRA is a Zcash node written entirely in Rust. Also affects zebra-script
• GHSA-gq4h-3grw-2rhv Zebra has Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale… Also affects zebra-script
• GHSA-h9hm-m2xj-4rq9 Zebra has Permanent Block Discovery Halt via Gossip Queue Saturation and Syncer Poisoning Also affects zebrad
• CVE-2026-44499 ZEBRA is a Zcash node written entirely in Rust. Also affects zebrad
• CVE-2026-44498 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