Vulnerability in Zcashfoundation Zebra
CVE-2026-104419
Zebra (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a syncing node so that honest peers get banned, eroding its peer set and raising eclipse risk.
Published .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ZcashFoundation/zebra/security/advisories/GHSA-qhr3-cvch-5fh2 (vendor-advisory)
- www.vulncheck.com/advisories/zebra-before-6.3.0-honest-peer-banning-via-far-ahe… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104419?
- CVE-2026-104419 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.8/10. Published 2026-10-02.
- How severe is CVE-2026-104419?
- Medium severity. CVSS v3 base score is 4.8 out of 10.