CVE-2026-109364

MEDIUM 5.3

Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-693
Vendor	zcashfoundation
Product	zebra
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

ZcashFoundation / zebra

2.3.0 < 6.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jhpp-8h75-7pv5 vulncheck.com: https://www.vulncheck.com/advisories/zebra-2.3.0-before-6.4.0-peer-ban-bypass-via-exact-ip-keying

Credits

🔍 conradoplg mpguerra