critical9.2
CVE-2026-34202
Zebra node crash — V5 transaction hash panic (P2P reachable)
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | zebrad | < 4.3.0 | 4.3.0 |
| rust | zebra-chain | < 6.0.1 | 6.0.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Zfnd | Zebra | before 4.3.0 |
| Zfnd | Zebra-Chain | before 6.0.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-qp6f-w4r3-h8wg
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg
- https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0
- https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements
- https://nvd.nist.gov/vuln/detail/CVE-2026-34202