---
title: "CVE-2026-34202: Zebra node crash — V5 transaction hash panic (P2P reachable)"
url: https://erroneo.us/security/cve/CVE-2026-34202/
description: "CVE-2026-34202 (zebrad (crates.io (Rust))): ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-31
date_modified: 2026-04-09
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-34202"
kev: false
cvss: 9.2
epss: 0.00929
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-34202: Zebra node crash — V5 transaction hash panic (P2P reachable)

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.9% , percentile 60: FIRST’s model estimates a 0.9% chance of exploitation activity in the next 30 days, higher than 60% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes zebrad (crates.io (Rust)) < 4.3.0, fixed in 4.3.0 ; zebra-chain (crates.io (Rust)) < 6.0.1, fixed in 6.0.1 . Check your lockfile, including transitive dependencies.

## What it is

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1.

## Affected packages

- crates.io (Rust) `zebrad` < 4.3.0 → fixed: 4.3.0
- crates.io (Rust) `zebra-chain` < 6.0.1 → fixed: 6.0.1

## Affected products (CVE record)

- ZcashFoundation zebra: < 4.3.0
- ZcashFoundation zebra-chain: < 6.0.1

## Severity

- GitHub_M CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.93% probability of exploitation activity in the next 30 days; percentile 60.

## Sources

- [GitHub Advisory GHSA-qp6f-w4r3-h8wg](https://github.com/advisories/GHSA-qp6f-w4r3-h8wg)
- [CVE.org record CVE-2026-34202](https://www.cve.org/CVERecord?id=CVE-2026-34202)
- [NVD entry CVE-2026-34202](https://nvd.nist.gov/vuln/detail/CVE-2026-34202)
- [github.com](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg)
- [github.com](https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0)
- [zfnd.org](https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements)

---
Source page: https://erroneo.us/security/cve/CVE-2026-34202/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt