What’s Vulnerable › Vulnerabilities
CVE-2026-44497: ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-08 · updated 2026-06-17
- Weakness: CWE-347
Description
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.
Affected products
- Zfnd Zebra-Script: before 6.0.0 — fixed in 6.0.0
- ZcashFoundation zebra: before 4.4.0 — fixed in 4.4.0
How to fix
Upgrade to a fixed version: Zfnd Zebra-Script 6.0.0; ZcashFoundation zebra 4.4.0. Check the vendor advisory for mitigations.
References
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