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 cleanup step wrongly downcasts RouterError to VerifyBlockError and discards the score, so attackers can repeatedly force block download and Equihash verification without being banned.
CVE-2026-104420
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-104420
zebra
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "ZcashFoundation",
"product": "zebra",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "6.3.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.3.0",
"versionType": "semver"
}
],
"packageURL": "pkg:cargo/zebrad",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-104420
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #8998 · Revision 1
- Added to Heist Feed
- Publisher date