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TI-2026-71180 Aliases CVE-2026-109364GHSA-vw8x-hqvx-7q8q

Peer ban bypass in Zcash Zebra via exact-IP ban keying

Priority LOW 36CWE-693Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-693.

Summary

Zebra from 2.3.0 before 6.4.0 contains a protection mechanism failure (CWE-693) that lets unauthenticated peers evade bans. Bans and misbehavior scores are keyed on exact IP addresses, so attackers can reconnect from fresh IPv6 addresses in their /64 allocation. Attackers can also flush the 20,000-entry FIFO ban list to restore access for banned peers.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00235 14th percentileScored 2026-11-07
Fix Fixed zebra (ZcashFoundation): 6.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ZcashFoundationzebra2.3.0 to before 6.4.06.4.0Patch availableCNA
  • zebra VendorZcashFoundation Affected 2.3.0 to before 6.4.0 Fixed in 6.4.0 Patch available CNA

Remediation

Upgrade ZcashFoundation Zebra to 6.4.0 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA zebra (ZcashFoundation) Fixed in 6.4.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    ZcashFoundation zebra 6.4.0

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-71182 Improper block validation in Zebra gossip lets peers drop new blocksPriority MEDIUM 61
    • TI-2026-71181 Zebra accepts forged block bodies, enabling denial of servicePriority LOW 27
    Show all 3 records →

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109364
  2. 2026-10-12 Alias added: GHSA-vw8x-hqvx-7q8q
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-13 CISA SSVC decision points changed

References

Advisory 1

  • TI-2026-66079 Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling CVSS 4.0HIGH 8.3
  • TI-2026-37850 ZEBRA: Mempool transaction admission denial via single-peer inbound queue saturation CVSS 3.1MEDIUM 5.3
  • TI-2026-71182 Improper block validation in Zebra gossip lets peers drop new blocks CVSS 4.0MEDIUM 6.3
  • TI-2026-29537 Zebra: addr/addrv2 Deserialization Resource Exhaustion CVSS 4.0MEDIUM 6.3
  • TI-2026-86702 Incomplete cleanup in Zebra lets peers stall initial sync CVSS 4.0HIGH 8.7
  • TI-2026-86701 Quadratic signature hashing in Zcash Zebra enables denial of service CVSS 4.0HIGH 8.7
See all 51 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences