CVE-2026-41583

[CVE catalog]

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.

Severity

Critical · CVSS 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

May 8, 2026, 3:16:41 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.28% · Oct 27, 2026

{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "zebra-script",
      "ecosystem": "cpe",
      "fixed_version": "5.0.2"
    },
    {
      "name": "zebrad",
      "ecosystem": "cpe",
      "fixed_version": "4.3.1"
    },
    {
      "name": "zebra-script",
      "ranges": [
        {
          "fixed": "5.0.2",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "5.0.2",
      "provider_record_id": "NVD-CVE-2026-41583"
    },
    {
      "name": "zebrad",
      "ranges": [
        {
          "fixed": "4.3.1",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "4.3.1",
      "provider_record_id": "NVD-CVE-2026-41583"
    }
  ]
}