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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2026-104420

Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocks

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

ZcashFoundation zebra

Default version status: unaffected

  • 0 to < 6.3.0affected
  • 6.3.0unaffected
pkg:cargo/zebrad

References