RCE in Zcashfoundation Zebra
CVE-2026-34202
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.009 · change: +0.002
Affected products
- Zcashfoundation Zebra — versions < 4.3.0
- Zcashfoundation Zebra-Chain — versions < 6.0.1
- Zfnd Zebra
- Zfnd Zebra-Chain
Weakness classification (CWE)
References
- github.com/ZcashFoundation/zebra/security/advisories/GHSA-qp6f-w4r3-h8wg (Vendor Advisory)
- github.com/ZcashFoundation/zebra/releases/tag/v4.3.0 (Release Notes)
- zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-im… (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-34202?
- CVE-2026-34202 is a high-severity vulnerability in Zcashfoundation Zebra, classified under Code Injection. CVSS score: 7.5/10. Published 2026-03-31.
- How severe is CVE-2026-34202?
- High severity. CVSS v3 base score is 7.5 out of 10.