CVE-2026-104423
Zebra before 6.2.1 Denial of Service via Uncapped V6 Shielded Proof Verification
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Zebra (zebrad) before 6.2.1 contains an asymmetric resource consumption vulnerability that allows unauthenticated peers to stall block verification by pushing V6 mempool transactions with invalid Halo2 proofs. Attackers can flood the shared unprioritized Halo2 verification queue with zero-fee transactions carrying zero-filled Orchard and Ironwood proofs, causing nodes to fall behind the chain tip.
| CWE | CWE-405 |
| Vendor | zcashfoundation |
| Product | zebra |
| Published | Oct 2, 2026 |
Stay Ahead of the Next One
Get instant alerts for zcashfoundation zebra
Be the first to know when new high vulnerabilities affecting zcashfoundation zebra are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ZcashFoundation / zebra
0 < 6.2.1
References
Credits
🔍 craftsoldier conradoplg upbqdn