CVE-2026-104420 — Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocks
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 clean…
Published: 2026-10-02 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7