CVE-2026-104420
Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocks
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 2, 2026
- Updated
- Oct 6, 2026
- Reserved
- Oct 2, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-704 Incorrect Type Conversion or Cast
Affected Products
| Product | Versions |
|---|---|
zebraZcashFoundation |
|
References
- GitHub Security Advisory (GHSA-8hh2-hrf2-cqf4)vendor-advisory
- VulnCheck Advisory: Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocksthird-party-advisory
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