CVE-2026-104436
Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.
| CWE | CWE-770 |
| 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:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
ZcashFoundation / zebra
0 < 4.5.0
ZcashFoundation / zebra
0 < 8.0.0
References
Credits
🔍 dingledropper mpguerra oxarbitrage