CVE-2026-104426
Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remaining_transaction_value that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactions in one block, stalling every validating node for over 52 seconds.
| CWE | CWE-407 |
| Vendor | zcashfoundation |
| Product | zebra |
| Published | Oct 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ZcashFoundation / zebra
0 < 6.1.0
References
Credits
🔍 ValarDragon oxarbitrage