Medium severity · published Oct 12, 2026
CVE-2026-109364
Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZE
zebra · ZcashFoundation
2.3.0 before 6.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109364
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109364
vendor-advisory
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jhpp-8h75-7pv5
third-party-advisory
https://www.vulncheck.com/advisories/zebra-2.3.0-before-6.4.0-peer-ban-bypass-via-exact-ip-keying
More from zebra
9.3
CVE-2026-52735
ZEBRA: Consensus divergence via P2SH sigop undercount in pure-Rust disabled-opcode parser
9.3
CVE-2026-54496
Missing copy constraint in halo2_gadgets variable-base scalar multiplication allows under-constrained base, breaking Orchard Action circuit soundness
9.1
CVE-2026-44497
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer
9.1
CVE-2026-41583
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling
8.7
CVE-2026-52736
ZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cache