# CVE-2026-40880

> Vulnerability · severity: **HIGH** (CVSS 8.1).

## Description

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.

## Key facts

- **CVE ID:** CVE-2026-40880
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 8.1
- **CWE codes:** CWE-1025

## Affected products

- `zfnd:zebra-consensus`
- `zfnd:zebrad`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40880

## Citation

> AI Analytics. CVE-2026-40880. Retrieved 2026-07-28 from https://api.ai-analytics.org/cve/CVE-2026-40880. Derived from NIST NVD. Licensed CC0.

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