Vulnerability in Zcashfoundation Zebra
CVE-2026-109364
Zebra 2.3.0 before 6.4.0 contains a protection mechanism failure that allows unauthenticated peers to evade bans because bans and misbehavior scores are keyed on exact IP addresses. Attackers can reconnect from fresh IPv6 addresses in their /64 allocation or flush the 20,000-entry FIFO ban list to restore access for banned peers.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
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-jhpp-8h75-7pv5 (vendor-advisory)
- www.vulncheck.com/advisories/zebra-2.3.0-before-6.4.0-peer-ban-bypass-via-exact… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109364?
- CVE-2026-109364 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2026-10-12.
- How severe is CVE-2026-109364?
- Medium severity. CVSS v3 base score is 5.3 out of 10.