medium5.3
CVE-2026-104420
Zebra before 6.3.0 contains a protection mechanism failure that allows unauthenticated peers to evade misbehavior scoring by supplying invalid gossiped blocks.
Impact
Zebra before 6.3.0 contains a protection mechanism failure that allows unauthenticated peers to evade misbehavior scoring by supplying invalid gossiped blocks. The inbound cleanup step wrongly downcasts RouterError to VerifyBlockError and discards the score, so attackers can repeatedly force block download and Equihash verification without being banned.
Affected products
| Product | Affected versions |
|---|---|
| Zebra | before 6.3.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.