CVE-2026-109364 Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying
Attackers can bypass peer bans in Zebra by using new IPv6 addresses or flushing the ban list, allowing continued access despite misbehavior.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109364?
CVE-2026-109364 is a medium-severity vulnerability in ZcashFoundation zebra, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-693
Which versions are affected by CVE-2026-109364?
How do I fix CVE-2026-109364?
No fix has been published for CVE-2026-109364 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109364 being exploited?
There is no known exploitation of CVE-2026-109364 in the wild and no public exploit code.
Sources
Also known as GHSA-jhpp-8h75-7pv5, GHSA-vw8x-hqvx-7q8q.