CVE-2026-44497
CriticalSummary
In ZEBRA, versions prior to 4.4.0 for zebrad and 6.0.0 for zebra-script had an issue with insufficient error handling during sighash computation, which could lead to the acceptance of an invalid hash type. This could create a consensus split between Zebra and zcashd nodes.
Risk Assessment
The organization may face consensus issues in the Zcash network, potentially leading to data inconsistencies and financial losses.
Recommendation
It is recommended to upgrade to zebrad version 4.4.0 and zebra-script version 6.0.0 to mitigate this vulnerability.
Original NVD description (English source)
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0 and prior to zebra-script version 6.0.0, the fix for CVE-2026-41583 introduced a separate issue due to insufficient error handling of the case where the sighash type is invalid, during sighash computation. Instead of returning an error, the normal flow would resume, and the input sighash buffer would be left untouched. In scenarios where a previous signature validation could leave a valid sighash in the buffer, an invalid hash-type could be incorrectly accepted, which would create a consensus split between Zebra and zcashd nodes. This issue has been patched in zebrad version 4.4.0 and zebra-script version 6.0.0.