What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-94

Description

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 products

• Zfnd Zebra: before 4.3.0 — fixed in 4.3.0
• ZcashFoundation zebra-chain: before 6.0.1 — fixed in 6.0.1

How to fix

Upgrade to a fixed version: Zfnd Zebra 4.3.0; ZcashFoundation zebra-chain 6.0.1. Check the vendor advisory for mitigations.

References

• https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0
• https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg
• https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements

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